Chemistry High School

what is the mass of a 1.00cm3 piece of iron having a density of 7.90g/cm3

Answers

Answer 1
7.90g/cm³ = 7.90g/1cm³ - this density means that 1 cm³ has mass = 7.90 g

Or you can do it another way
1.0 cm³*7.90 g/cm³= 7.90 g
Answer 2

Answer:

Mass of iron = 7.90 g

Explanation:

Given:

Volume of iron, V = 1.00 cm3

Density of iron, D = 7.90 g/cm3

To determine:

Mass of iron, M

Explanation:

Density of a substance is the mass occupied by it in a given volume

I.e. [tex]Density = \frac{Mass}{Volume}[/tex]

[tex]Mass = Density*Volume[/tex]

For the given piece of iron:

[tex]Mass = 7.90 g/cm3 * 1.00 cm3 = 7.90 g[/tex]

Related Questions

What is the mass of aluminum metal that releases 22.4 l of hydrogen gas at stp from hydrochloric acid? __al(s) + __hcl(aq) → __alcl3(aq) + __h2(g) 18.0 g 81.0 g 9.00 g 40.5 g 27.0 g?

Answers

The mass  of  Al  metal   that releases 2.4 L  of hydrogen gas at STP  is calculated as below

AT  STP  1 mole  =22.4 l
what about 22.4l =? moles
(22.4 L x 1  mole) /22.4 L= 2mole

write the reacing reaction

2Al+ 6 HCL = 2AlCl3 + 3H2
by use of  mole ratio between  Al to  H2  which is 2 : 3  the   mole Al = 1 x2/3 = 0.667 moles
mass =moles x molar mass
=0.667 mole  x27 g/mol= 18  grams

The more kinetic energy there is an a sample of matter, the-
A.more energy is absorbed as heat
B.more energy is given off as heat
C.Lower the temperature
D.higher the temperature

Answers

The more kinetic energy there is an a sample of matter, the higher the temperature.

What is kinetic molecular theory?

Average kinetic molecular theory states that kinetic energy of any sample of gas molecules is directly proportional to the absolute temperature of that sample.

More kinetic energy means more energy is absorbed as heat is wrong.More kinetic energy means more energy is given off  as heat is also wrong.More kinetic energy will lower the temperature is also incorrect.

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The correct answer is D. higher the temperature.

The kinetic energy of a sample of matter is directly related to its temperature. As the kinetic energy of the particles in a substance increases, the temperature of the substance also increases. This is because temperature is a measure of the average kinetic energy of the particles in a substance. Therefore, if there is more kinetic energy in a sample of matter, the temperature will be higher.

Here's the logic behind the relationship between kinetic energy and temperature:

When particles in a substance move faster, they have more kinetic energy.

The faster movement of particles leads to more frequent and more energetic collisions between particles.

These more energetic collisions result in a greater transfer of energy when the substance comes into contact with another substance, which we perceive as a higher temperature.

The other incorrect options are:

A. more energy is absorbed as heat: This option is incorrect because the statement refers to the absorption of energy, which is not directly related to the kinetic energy already present in the sample.

B. more energy is given off as heat: This option is incorrect because it suggests that the sample is losing energy, which would lead to a decrease in temperature, not an increase.

C. Lower the temperature: This option is incorrect because it directly contradicts the relationship between kinetic energy and temperature; more kinetic energy means a higher temperature, not a lower one.

A 10.00L sample of gas has a mass of 11.92g at stp. What is the molar mass of the gas?

Answers

Let's assume that the gas is an ideal gas.

1 mole of ideal gas has the volume as 22.4 L at STP (273 K , 1 atm)

The given gas has 10.00 L. Hence we can find out the moles of gas.

moles in 22.4 L gas = 1 mol
moles in 10.00 L gas = [tex] \frac{1 mol * 10.00 L}{22.4 L} [/tex] = 0.446 mol

moles = mass / molar mass

hence, molar mass = mass / moles
                               = 11.92 g / 0.446
                               = 26.73 g/mol

Hence, the molar mass of the gas is 26.73 g/mol
As we know STP means Standard Temperature and Pressure. Where, Pressure is 1 atm and temperature is 273 K and also Ideal gas law ( PV=nRT) or (PV = w/M RT)

Where –

P = Pressure in atmV = Volume in Ln = moles R = Ideal gas law constant T = Temperature in Kw = Given MassM = Molar Mass

Now, according to the question –

w =11.92 g V = 10 L P = 1 atmT = 273 KR = 0.0821 atm L/ mol K

Calculation –

[tex]\qquad[/tex] [tex]\pink{\twoheadrightarrow\bf PV = nRT}[/tex]

[tex]\qquad[/tex] [tex]\pink{\twoheadrightarrow\bf PV = \dfrac{w}{M}\times RT}[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf\dfrac{w}{M} = \dfrac{PV}{RT}[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf \dfrac{M}{w} = \dfrac{RT}{PV}[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf M = \dfrac{RT}{PV}\times w[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf M = \dfrac{0.0821 \times 273 }{1 \times 10 } \times 11.92 [/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf M = \dfrac{22.4}{10} \times 11.92[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf M = 2.24\times 11.92[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf M = 26.7 [/tex]

[tex]\qquad[/tex] [tex]\pink{\twoheadrightarrow\bf M = 26.7\: g}[/tex]

Henceforth, Molar Mass is 26.7 g

_______________________________________

When doing the systematic treatment of equilibrium for a strong acid is oh?

Answers

The storong acid is never OH but we have to affirm that in aacid-base solution, oh can give up its H to become O

A hydrocarbon that includes a triple covalent bond is classified as _____.

Answers

Hydrocarbons with triple bonds are classified as Alkynes. 

Alkynes have one or more triple bonds between two Carbon atoms but the general formula is CnH2n-2. One is σ bond and rests are π bonds. Hence, alkynes are called as unsaturated hydrocarbons. 

acids increase the concentration of __________ in a solution
A. hydroxide
B. hydronium
C. chloride

Answers

A. hydroxide is the answer
Acids increase the concentration of A. Hydroxide

What binary compound would be formed from barium ions and fluoride ions?

Answers

Barium fluoride (BaF2) - Also known as Barium(II) fluoride - because it's a combination of two different kinds of ions (binary = two).

How to find the density of a liquid given only volume and molecular weight?

Answers

If you’re given molecular weight, you know that density is mass/volume. You need to convert the molecular weight to volume. If you know what molecule it is, use the gram formula mass to convert it into grams.

What is the ionic form of this unbalanced equation? mno2 + hno2 → mn(no3)2 + h2o?

Answers

The  ionic  form  of  the unbalanced  equation

MnO2  +HNO2 =  Mn(NO3)2  +H2O  is  as   below

MnO2(s)   +  H^+(aq)  + NO2^-(aq) = Mn^2+(aq)  + No3^-(aq)  +  H20(l)

MnO2   does  not  dissociate  since it is  in solid state. In   addition H2O   is in liquid  state  thus  does  not  dissociate in to  ions

Which compound contains a triple bond?

Answers

Final answer:

A compound with a triple bond, like acetylene, is a molecule where three pairs of electrons are shared between two atoms. Acetylene contains a triple bond between its two carbon atoms. These bonds are strong, robust, and render unique properties to the compound.

Explanation:

A compound that contains a triple bond is a molecule in which three pairs of electrons are shared between two atoms, making it a very strong connection. An example of such a compound is acetylene (C2H2), which contains a triple bond between the two carbon atoms. The presence of triple bonds results in substances with unique properties when compared to compounds with only single or double bonds.

The triple bond in acetylene is formed by one sigma bond and two pi bonds. This means that acetylene is a more robust compound because of the strength of the triple bond. Additionally, molecules with triple bonds often have interesting chemical reactivities which make them important in various fields such as organic chemistry or industrial synthesis.

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Which of the elements has the same lewis structure as sulfur?

Answers

The answer is Oxygen.  The elements that has the same lewis structure as sulfur is Oxygen. This is due to the fact that although the two compounds have different electronic configurations, the two have the same arrangement of electrons in their outermost orbits. 

How many moles of h2so4 are needed to neutralize 1.56 moles of koh?

Answers

the balanced equation for the above neutralisation reaction is as follows;
2KOH + H₂SO₄ --> K₂SO₄ + 2H₂O
stoichiometry of KOH to H₂SO₄ is 2:1
neutralisation is the reaction between H⁺ ions and OH⁻ ions to form water which is neutral
number of KOH moles - 1.56 mol 
2 mol of KOH require 1 mol of H₂SO₄ for neutralisation
therefore 1.56 mol of KOH require - 1/2 x 1.56 mol = 0.78 mol 
0.78 mol of H₂SO₄ are required for neutralisation  

Which of the following is not a postulate of the kinetic-molecular theory? A. Gas particles have a high force of attraction to one another or to the walls of the container. B. The distance between gas particles is much larger than the size of the particles themselves. C. Gas particles will always travel in a straight line until they hit a container wall or another gas particle. D. Gases are made up of particles that act like little, hard spheres that are always moving in a random fashion.

Answers

Following are important postulates of Kinetic theory of gases

1) Gases are made up of number of particles. 
this particles  behaves like hard and spherical objects, which are in constant state of motion.
2)  The particles always travel in a straight line until they collide with another particle or the walls of the container.
3) Particles are of smaller size as compared to the distance between particles.
4) There exist minimal/no force of attraction between the gas particles neither there exist attractive interaction between the particles and the walls of the container.
5) Collisions between gas particles or with the walls of the container are  elastic in nature. 

Thus, statement a i.e. Gas particles have a high force of attraction to one another or to the walls of the container contradicts the postulates of kinetic theory of gases

Know how you would determine the percent yield of a reaction if you have the given amount of the reactants and the amount of the product actually collected in the lab.

Answers

First, use the given amount of reactants to calculate the theoretical amount of products that should be formed based on stoichiometry. Next, divide the actual amount of obtained product by that theoretical amount, and multiply by 100%. This gives the percent yield of the reaction.

When only one pair of shared electrons is involved in a covalent bond, the linkage is called a ________ bond. triple double single resonant?

Answers

The answer is Single.  When only one pair of shared electrons is involved in a covalent bond, the linkage is called a single bond. A single bond is usually a σ bond. 

What element will result if a proton is added to the nucleus of carbon?

Answers

Nitrogen because it has one more proton than carbon.
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