1. What mass of H2O will be produced if 9.5 g of H2 reacts with 1.2 g of O2?
__ H2 + __ O2 --> __ H2O
2. If 1.85 g of Mg(OH)2 reacts with 3.71 g of HCl, how much MgCl2 is produced? What is the limiting reactant?
__ Mg(OH)2 + __ HCl --> __ MgCl2 + __ H2O
3. What mass of potassium hydroxide is formed when 8.2 g of potassium oxide is added to 1.3 g of water?
__ K2O + __ H2O --> __ KOH
4. What mass of aluminum chloride could be made from 8.1 g of aluminum and 4.2 L of chlorine at STP?
__ Al + __ Cl2 --> __ AlCl3
I know this is a lot of questions but please help and show your work. Thank you.
Answers
1) The answer is: mass of water is 1.35 grams.
Balanced chemical reaction: 2H₂ + O₂ → 2H₂O.
m(O₂) = 1.2 g; mass of oxygen.
M(O₂) = 2 · 16 g/mol.
M = 32 g/mol, molar mass of oxygen.
n(O₂) = m(O₂) ÷ M(O₂).
n(O₂) = 1.2 g ÷ 32 g/mol.
n(O₂) = 0.0375 mol; amount of oxygen, limiting reactant.
m(H₂) = 9.5 g; mass of hydrogen.
M(H₂) = 2 g/mol, molar mass of hydrogen.
n(H₂) = m(H₂) ÷ M(H₂).
n(H₂) = 9.5 g ÷ 2 g/mol.
n(H₂) = 4.5 mol; amount of hydrogen.
From chemical reaction: n(O₂) : n(H₂O) = 1 : 2.
n(H₂O) = 0.0375 mol · 2.
n(H₂O) = 0.075 mol; amount of water.
m(H₂O) = n(H₂O) · M(H₂O).
m(H₂O) = 0.075 mol · 18 g/mol.
m(H₂O) = 1.35 g; mass of water.
2) The answer is: 3.05 grams of MgCl₂ is produced, the limiting reactant is Mg(OH)₂.
Balanced chemical reaction: 2HCl + Mg(OH)₂ → MgCl₂ + 2H₂O.
m(Mg(OH)₂) = 1.85 g; mass of magnesium hydroxide
n(Mg(OH)₂) = m(Mg(OH)₂) ÷ M(Mg(OH)₂).
n(Mg(OH)₂) = 1.85 g ÷ 58.32 g/mol.
n(Mg(OH)₂) = 0.032 mol; limiting reactant.
m(HCl) = 3.71 g; mass of hydrochloric acid.
n(HCl) = 3.71 g ÷ 36.46 g/mol.
n(HCl) = 0.102 mol; amount of hydrochloric acid.
From chemical reaction: n(Mg(OH)₂) : n(MgCl₂) = 1 : 1.
n(MgCl₂) =0.032 mol; amount of magnesium chloride.
m(MgCl₂) = n(MgCl₂) · M(MgCl₂).
m(MgCl₂) = 0.032 mol · 95.21 g/mol.
m(MgCl₂) = 3.05 g; mass of magnesium chloride.
3) The answer is: mass of potassium hydroxide is 8.1 grams.
Balanced chemical reaction: K₂O + H₂O → 2KOH.
m(K₂O) = 8.2 g; mass of potassium oxide.
n(K₂O) = m(K₂O) ÷ M(K₂O).
n(K₂O) = 8.2 g ÷ 94.2 g/mol.
n(K₂O) = 0.087 mol; amount of potassium oxide.
m(H₂O) = 1.3 g; mass of water.
n(H₂O) = 1.3 g ÷ 18 g/mol.
n(H₂O) = 0.072 mol; limiting reactant.
From chemical reaction: n(H₂O) : n(KOH) = 1 : 2.
n(KOH) = 2 · 0.072 mol.
n(KOH) = 0.144 mol.
m(KOH) = 0.144 mol · 56.1 g/mol.
m(KOH) = 8.1 g; mass of potassium hydroxide.
4) The answer is: mass of aluminum chloride is 16.66 grams.
Balanced chemical reaction: 2Al + 3Cl₂ → 2AlCl₃.
m(Al) = 8.1 g; mass of aluminium.
n(Al) = m(Al) ÷ M(Al).
n(Al) = 8.1 g ÷ 27 g/mol.
n(Al) = 0.3 mol.
V(Cl₂) = 4.2 L; volume of chlorine.
n(Cl₂) = 4.2 L ÷ 22.4 L/mol.
n(Cl₂) = 0.1875 mol; limiting reactant.
From chemical reaction: n(Cl₂) : n(AlCl₃) = 3 : 2.
n(AlCl₃) = 2 · 0.1875 mol ÷ 3.
n(AlCl₃) = 0.125 mol; amount of aluminium chloride.
m(AlCl₃) = 0.125 mol · 133.34 g/mol.
m(AlCl₃) = 16.66 g; mass of aluminium chloride.
Related Questions
In order to reproduce, many flowering plants use external agents, such as insects or birds, to aid in the pollination process. What function do the color and odor of the flowers provide for the flowering plants?
A.
They help the plant feel happy and confident.
B.
They attract birds and insects which aid in the pollination process.
C.
They scare off larger animals that eat plants.
D.
They keep the pollinating insects from eating the plants.
Answers
The insects, birds, etc. are called pollinators. Because they help in pollination. The flowers attract birds and insects which aid in the pollination process. The correct option is B.
What is pollination?The process in which the pollen grains are transferred from the anther to the stigma of flowers is defined as the pollination. The agents which are responsible for the pollination are pollinators.
The flowers use scent to attract pollinators. A signal which helps the pollinators to find the particular flower is known as the scent. These floral scents are known to be a complex mixture of highly volatile compounds and essential oils that is emitted by the flowers into the atmosphere.
A flower scent's structure, color, and odor are the important factors which attract the pollinators. Those plants pollinated by bees and flies have sweet scents and those pollinated by beetles have fruity odors.
Thus the correct option is B.
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The activation energy for the reaction no2(g)+co(g)⟶no(g)+co2(g) is ea = 175 kj/mol and the change in enthalpy for the reaction is δh = -200 kj/mol . what is the activation energy for the reverse reaction?
Answers
Final answer:
The activation energy for the reverse reaction of NO2(g) + CO(g) → NO(g) + CO2(g) is 375 kJ/mol. This is calculated using the formula that subtracts the change in enthalpy from the activation energy of the forward reaction.
Explanation:
The activation energy for the reverse reaction can be determined using the concept that the activation energy for a reaction and the activation energy for the reverse reaction must total the energy difference between the reactants and the products, which is given by the change in enthalpy (ΔH). The given forward reaction NO2(g) + CO(g) → NO(g) + CO2(g) has an activation energy (Ea) of 175 kJ/mol and a change in enthalpy (ΔH) of -200 kJ/mol.
To find the activation energy for the reverse reaction, we use the formula:
Activation energy of reverse reaction = Activation energy of forward reaction - ΔH
Plugging in the values we get:
Activation energy of reverse reaction = 175 kJ/mol - (-200 kJ/mol)
This calculation yields an activation energy for the reverse reaction of 375 kJ/mol.
what type of science uses the ph scale
Answers
What element is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p65s2 4d10 5p4?
Answers
The element with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4 is Tin (Sn). This is found by adding up the electrons in each part of the configuration.
Explanation:The electron configuration provided, 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4, represents the element Sn, or Tin in the periodic table. The configuration corresponds to the distribution of electrons among different energy levels (shells) and sub-levels in an atom. To identify the element, we add up the electrons represented by each part of the configuration (e.g., s2 implies 2 electrons, p6 implies 6 electrons etc.). We see that the total number of electrons is 50, which corresponds to the atomic number of Tin (Sn) in the periodic table.
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What is the molar mass of BF3
Answers
B = 11 grams / mol
F = 19 grams / mol
This stuff has a formula of BF3.
The 3 only affects the F. There is 1 Boron and 3 florines. If you want a number to affect the Boron, use brackets. In this case, we don't.
BF3 = 11 + 3*19 = 11 + 57 = 68 grams / mol
Molar Mass BF3 = 68 grams /mol <<<< ==== answer
Write a balanced symbol equation for the complete combustion of propanol
Answers
I hope it helped you!
What is the ph of a soft drink in which the major buffer ingredients are 6.6 g of nah2po4 and 8.0 g of na2hpo4 per 355 ml of solution?
Answers
Therefore, the number of moles = 6.6/120
= 0.055 moles of NaH2PO4 which is also equal to the number of moles of H2PO4.
[H2PO4-] = Number of moles oof H2PO4-/Volume of the solution in L
= 0.055/ ( 355 ×10^-3)
= 0.155 M
Na2HPO4 undergoes complete dissociation as follows;
Na2HPO4 (aq)= 2Na+ (aq) + HPO4^2- (aq)
1 mole of Na2HPO4 = 142 g/mol
Therefore; number of moles = 8.0/142
= 0.0563 moles
[HPO4 ^-2] is given by no of moles HPO4^2- /volume of the solution in L
= 0.0563/(355×10^-3)
= 0.1586 M
Both H2PO4^2- and HPO4^2- are weak acids the undergoes partial dissociation
Ka of H2PO4- = 6.20 × 10^-8
[H+] =Ka*([H2PO4-]/[HPO4(2-)]
= (6.20 ×10^-8)×(0.155/0.1586)
= 6.059 ×10^-8 M
pH = - log[H+]
= - log (6.059×10^-8)
= 7.218
pH is the estimation of the acidity and the basicity of the solution. The pH of the soft drink with buffer ingredients will be 7.218.
What is pH?pH is the negative logarithm of the hydrogen ion concentration in an aqueous solution.
Moles of sodium dihydrogen phosphate is calculated as:
[tex]\begin{aligned}\rm moles &= \dfrac{6.6}{120} \\\\&= 0.055 \;\rm moles \end{aligned}[/tex]
The molar concentration of dihydrogen phosphate is calculated as,
[tex]\begin{aligned} &= \dfrac{\text{Moles of dihydrogen phosphate}}{\text {Volume }}\\\\&= \dfrac{0.055}{355 \times 10^{-3}}\\\\&= 0.155 \;\rm M\end{aligned}[/tex]
The complete dissociation of monosodium phosphate can be shown as,
[tex]\rm Na_[2}HPO_{4} (aq) \rightarrow 2Na^{+} (aq) + HPO_{4}^{2-} (aq)[/tex]
When 1 mole of monosodium phosphate = 142 g/mol
Then, moles = 0.0563 moles
The molar concentration of dihydrogen phosphate will be:
[tex]\begin{aligned} &= \dfrac{0.0563}{( 355 \times 10^{-3})}\\\\&= 0.1586\;\rm M\end{aligned}[/tex]
The partial dissociation of both the weak acid is given as:
[tex]\begin{aligned}\rm [H^{+}] &= \rm Ka \times \dfrac{([H_{2}PO_{4}^{-}]}{[HPO_{4}^{2-}]}\\\\ &= (6.20 \times 10^{-8}) \times (\dfrac{0.155}{0.1586})\\\\ &= 6.059 \times 10^{-8}\;\rm M \end{aligned}[/tex]
pH can be calculated as:
[tex]\begin{aligned} \rm pH &= \rm - log[H^{+}]\\\\ &= \rm - log (6.059 \times 10^ {-8})\\\\ & = 7.218\end{aligned}[/tex]
Therefore, 7.218 is the pH.
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Consider the reaction: 2A(g)+B(g)→3C(g). When A is changing at a rate of -0.110M⋅s−1, How fast is C increasing?
Answers
r = -(1/2) dA / dt = - dB / dt = (1/3) dC/ dt
Note that A and B charge is negative due to they decrease with time
given dA / dt = -0.110 M/s
hence dB / dt = -0.110 / 2 = -0.055 M/s
dC / dt = (-3/2) (-0.110) = 0.165 M/s
The diagram represents wavelengths of different colors of visible light that pass by in a specific time period.
Answers
the answer is Violet.
White light is a combination of all colors of in the color spectrum, that is it has all the colors of the rainbow. Combining primary colors of light like red, blue, and green creates secondary colors such as yellow, violet among others. One end of the spectrum is red light, with the longest wavelength and lowest frequency, while on the other end there is violet color with the shortest wavelength and the greatest frequency.
Answer:
Violet
Explanation:
atoms with 5 valence electrons usually form how many bonds?,
Answers
#1: Which scientist is credited with developing the orbital model of the atom?
A. J.J. Thomson
B. Ernest Rutherford
c. Niels Bohr
D. Democritus
***idk really... I'm guessing jj thomson tho... not too sure.. :/,
Answers
How do you balance this chemical equation?
barium chlorate --> barium chloride + oxygen
I'm really confused on this question because it contains some ionic compounds. How would you balance it? Thanks!,
Answers
The fact that there are some ionic compounds doesn't matter. Just use the formulas.
barium chlorate = Ba(ClO3)2
barium chloride = BaCl2
Oxygen = O2
Now create the unbalanced equation
Ba(ClO3)2 --> BaCl2 + O2
And balance in the usual fashion. Count the atoms of each element on both sides
Ba = 1, 1
Cl = 2, 2
O = 6, 2
And oxygen is out of balance. But can be easily handled with a 3 coefficient on the right hand side. So:
Ba(ClO3)2 --> BaCl2 + 3 O2
And we have a balanced equation.
To balance the equation for the decomposition of barium chlorate into barium chloride and oxygen, ensure that there are equal numbers of each atom on both sides of the equation. The balanced equation is 2 Ba(ClO₃)₂ → 2 BaCl₂ + 3 O₂.
To balance the chemical equation for the decomposition of barium chlorate into barium chloride and oxygen, we must ensure that the number of each type of atom is the same on both sides of the equation. The formula for barium chlorate is Ba(ClO₃)₂, barium chloride is BaCl₂, and oxygen is O₂ (since oxygen is a diatomic molecule).
The unbalanced equation is as follows:
Ba(ClO₃)₂ → BaCl₂ + O₂
To balance this equation:
First, balance the oxygen atoms. There are 6 oxygen atoms on the reactant side (from two chlorate ions) and 2 on the product side (one O₂ molecule). Place a coefficient of 3 in front of the O₂ to balance the oxygen atoms.Now, check the barium and chlorine atoms. Each side has one barium atom and two chlorine atoms, so they are already balanced.The balanced equation is:
2 Ba(ClO₃)₂ → 2 BaCl₂ + 3 O₂
50 g of nitrogen (n2) has a volume of ___ liters at stp. (40 l)
Answers
m(N₂) = 50 g.
n(N₂) = m(N₂) ÷ M(N₂).
n(N₂) = 50 g ÷ 28 g/mol.
n(N₂) = 1,785 mol.
V(N₂) = n(N₂) · Vm.
V(N₂) = 1,785 mol · 22,4 L/mol.
V = 40 L.
Vm - molare volume on STP.
50 g of nitrogen (n2) has a volume of 40 liters at stp.
The question is asking for the volume of 50 g of nitrogen (N2) gas at standard temperature and pressure (STP), which is defined as 0 degrees Celsius and 1 atmosphere of pressure. At STP, one mole of an ideal gas occupies 22.4 liters. First, to find the volume, we need to calculate the number of moles of nitrogen gas we have using its molecular weight (28.0 g/mol):
Number of moles (n) = Mass of N2 (g) / Molecular weight of N2 (g/mol) = 50 g / 28.0 g/mol ≈ 1.786 moles
Now applying the molar volume at STP:
Volume (V) = n (moles) × Molar volume at STP (L/mol) = 1.786 moles × 22.4 L/mol ≈ 40 liters
So, 50 g of nitrogen gas has a volume of approximately 40 liters at STP.
Which Of the following compounds is an electrolyte?
a)rubbing alcohol
b)sugar
c)silicon dioxide
d)sodium hydroxide
Answers
Here is your answer:
The proper answer to this question is option D "sodium hydroxide".
Here is how:
Sodium Hydroxide its a white substance that is a electrolyte.
Your answer is D.
If you need anymore help feel free to ask me!
Hope this helps!
Calculate the number of moles of aluminum, sulfur, and oxygen atoms in 4.00 moles of aluminum sulfate, al2(so4)3. express the number of moles of al, s, and o atoms numerically, separated by commas.
Answers
Explanation:
1) Aluminum:
There are 2 atoms of Al in the unit formula Al₂(SO₄)₃, so there are 4x2 = 8 atoms of Al in 4 unit formulas of the same compound.
2) Sulfur:
There are 3 atoms of S in the unit formula Al₂(SO₄)₃, so there are 4x3 = 12 atoms of S in 4 unit formulas of the same compound
3) Oxygen:
There are 4x3 = 12 atoms of O in the unit formula Al₂(SO₄)₃, so there are 4x12 = 48 atoms of O in 4 unit formulas of the same compound.
So, the answer is 8, 12, 48
The number of moles of aluminum, sulfur, and oxygen atoms in 4.00 moles of aluminum sulfate, Al₂(SO₄)₃ are 8.00, 12.00, and 48.00, respectively.
Aluminum: There are 2 aluminum atoms in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 2 x 4.00 = 8.00 moles of aluminum atoms.
Sulfur: There is 1 sulfur atom in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 1 x 4.00 = 12.00 moles of sulfur atoms.
Oxygen: There are 12 oxygen atoms in each molecule of aluminum sulfate. So, in 4.00 moles of aluminum sulfate, there are 12 x 4.00 = 48.00 moles of oxygen atoms.
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Which product besides radiation do radioactive atoms give off when they decay?
A.
heat energy
B.
poisonous gases
C.
ridge pushes
D.
p waves
Answers
The radiations are released in the radioactive decay along with the heat energy. Thus, option A is correct.
What are radioactive atoms?The radioactive atoms are given as the one that has the presence of unstable nuclei. The unstable nuclei have been giving off radiations that form them to attain stability.
The radioactive atoms have been emitting the radiations from the nucleus to become stable, and the nuclear or the radioactive radiations from the radioactive decay.
The decay of the radioactive elements releases the radiations such as alpha, beta, gamma, and other radiations. The decay along with the release of the radiation releases energy.
Therefore, in radioactive decay, the atoms along with the radiations release heat energy. Thus, option A is correct.
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#1: Karen measures the volume of a gas at 200 K and 100 kPa. To correct her measurement to standard temperature and pressure (STP), what must she do?
A. make a volume correction based on a higher pressure of 200 kPa
B. make a volume correction based on a higher temperature of 273 K
C. make a volume correction based on a lower pressure of 50 kPa
D. make a volume correction based on a lower temperature of 73 K
**my answer: B
is that right?,
Answers
What motivated arrhenius to calculate how changes in carbon dioxide might affect the climate?
Answers
He was the first to use basic principles of physical chemistry to calculate estimates of the extent to which increases in atmosphere carbon dioxide increases Earth's surface temperature through the Arrhenius effect. Arrhenius's paper was the first to quantify the contribution of carbon dioxide to the greenhouse effect and to speculate whether variations in the atmospheric concentration of carbon dioxide have contributed to long-term variations in climate.
The main source of phosphorous is in: rocks water plants the atmosphe
Answers
Answer:
rocks
Explanation:
Answer:
Rocks
Explanation:
How many grams of CO2 are in 6 mol of the compound (this is a science question)? and the units?
Answers
M(CO₂) = 12 g/mol + 2 · 16 g/mol.
M(CO₂) = 44 g/mol.
m(CO₂) = n(CO₂) · M(CO₂).
m(CO₂) = 6 mol · 44 g/mol.
m(CO₂) = 264 g.
n(CO₂)- amount of substance of carbon dioxide.
m(CO₂) - mass of carbon dioxide.
M(CO₂) - molar mass of carbon dioxide.
Which statement describes the periodic law?
Metals are both good conductors of heat and electricity.
Atomic masses always increase across a period.
Nonmetals are of the most reactive elements.
Elements in the same group have similar chemical properties.
Answers
Periodic law is the arrangement of the elements in order of increasing atomic number.
For example all alkaline metals (I group of periodic table, Na, K, Cs...) loose one electron in chemical reaction and react vigorously with water.
elements is the same group have similar chemical properties
Determine the molecular formula of a compound that is 54.5% C, 13.7% H, and 31.8% N. The molar mass is 88.0.
Answers
54.5/12 : 13.7/1 : 31.8/14
4.5/2.3 : 13.7/2.3 : 2.3/2.3
2 : 6 : 1
this is the ratio for emperical fromula
C2H6N
now the emperical formula mass will be
12x2 + 1x6 + 14x1
=44
the value to multiple the emperical formula =
molar mass/emperical formula mass
88/44= 2
2( C2H6N)
= C4H12N2
Using the equation 2H2 + O2 --> 2 H2O, if 192 g of O are produced, how many grams of hydrogen must react with it? Help me understand how to do this?
Answers
If there are 192 grams of O2, then:
192 grams x (1 mole/32g) = 6 moles of O2.
To react each mole of oxygen, you need 2 moles of hydrogen (H2). You can see this in the equation 2H2 + O2 --> 2 H20.
To react 6 moles of O2, you need 12 moles of H2.
Now that we have the total moles of hydrogen needed, we now use the molar mass of H2 (2 grams/mole)
12 moles H2 x (2 grams/1 mol H2) = 24 grams of H2.
A species that changes the rate of a reaction but is neither consumed nor changed is
A. A catalyst.
B. An activated complex.
C. An intermediate.
D. A reactant.
Answers
A. A catalyst!!!
Hope it Helps!!!
What is the value of ∆G in a spontaneous reaction?
less than 0
greater than 0
equal to 0
equal to 1
Answers
Each equation is incorrect. find the errors, then rewrite and balance each equation. cl2 + nai → nacl2 + i nh3 → n + h2 na + o2 → nao2
Answers
Chlorine and iodine are diatomic molecules.
2) Balanced chemical reaction: 2NH₃ → N₂ + 3H₂.
Nitrogen and hydrogen are diatomic molecules.
3) Balanced chemical reaction: 4Na + O₂ → 2Na₂O.
Sodium in compounds has oxidation number +1 and oxygen -2.
1) Balanced chemical reaction: Cl₂ + 2NaI → 2NaCl + I₂.
Chlorine and iodine are diatomic molecules.
2) Balanced chemical reaction: 2NH₃ → N₂ + 3H₂.
Nitrogen and hydrogen are diatomic molecules.
3) Balanced chemical reaction: 4Na + O₂ → 2Na₂O.
Sodium in compounds has oxidation number +1 and oxygen -2.
sodium bicarbonate reacts with sulfuric acid to form sodium sulfate, carbon dioxide, and water. calculate the mass od sodium bicarbonate necessary to produce 1.75 g of carbon dioxide gas.
How would i even go about doing this?,
Answers
You have 2 moles of CO2 at the end and 2 moles of NaHCO3 at the beginning Now You have moles of NaHCO3 multiply molar mass of NaHCO3 by the moles of NaHCO3 to get only mass of NaHCO3 initial.
#1: Martha has a large amount of 1.25 M H2SO4 in her lab. She needs 36 grams of H2SO4 for a chemical reaction she wants to perform. How many liters of the solution should she use?
A. 2.9 L
B. 5.8 L
C. 0.58 L
D. 0.29 L
***my answer: D. 0.29 L
is that right? @chmvijay :),
Answers
Answer:
D. 0.29 L
Explanation:
To calculate the required volume, we can convert the concentration of the solution from M to g/L, keeping in mind the molar mass of H₂SO₄, 98 g/mol :
1.25 [tex]\frac{mol}{L}*\frac{98g}{1mol}=[/tex]122.5 g/L
So a concentration of 1.25 M of H₂SO₄ is the same as a concentration of 122.5 g/L.
Finally we divide 36 grams by the concentration:
[tex]\frac{36g}{122.5g/L}[/tex] = 0.29 L
So your answer was correct, it is option D.
The typical carbon atom is described in the periodic table by the accompanying box. how many neutrons are in a typical carbon atom?
Answers
#1: What is usually released in a combustion reaction?
A. energy
B. elemental oxygen
C. a carbon-based fuel
D. elemental carbon
**my answer; A. energy
is that right?,