Calculate the number of moles of sodium chloride (NaCl) formed if 0.345

moles of calcium chloride (CaCl2) react.


1 Na2CO3 (aq) + 1 CaCl2 (aq) – 1 CaCO3 (s) + 2 NaCl (aq)


= ________ Moles ?

Answer:

119 protons and 179 neutrons

Explanation:

Given an element of the form AB-298, we know that 298 is the mass, which means it's the sum of the number of protons and number of neutrons.

Look at the answer choices and find the one whose numbers add up to 298. Only C (119 protons and 179 neutrons) is correct because 119 + 179 = 298.

Hope this helps!

Answer:

Energy cannot be created nor destroyed

Explanation:

Law of conservation of energy

Answer:

0.142 M

Explanation:

First, convert grams of CaCl2 to moles.  The molar mass of CaCl2 is 110.984 g/mol.  You should get 0.0135 moles.

Divide moles by liters to find molarity.  You should get 0.142 M

Answer:

1.42 L

Explanation:

Step 1:

The following data were obtained from the question :

Molarity of KBr = 2.40 M

Mole of KBr = 3.40 moles

Volume of solution =?

Step 2:

Determination of the volume of the solution.

Molarity of solution is simply the mole of the solute per unit volume the of solution. It is given as :

Molarity = mole /Volume

Volume = mole /Molarity

Volume = 3.4/2.4

Volume = 1.42 L

Therefore, the volume of the solution is 1.42 L

Answer: B. If students spend at least 1 hour per night studying math, then  they will get a grade of 85 or higher.

Explanation: A hypothesis is defined as a tentative or predictions or an educated guess of scientific questions. A hypothesis is always done before performing an experiment.

The correct hypothesis for the given experiment will be "If students spend at least 1 hour per night studying math, then  they will get a grade of 85 or higher" because it has an if-then statement which is a conditional statement where statement after "if represents hypothesis" and "then represents conclusion".

Hence, the correct answer is "B. If students spend at least 1 hour per night studying math, then  they will get a grade of 85 or higher."

A possible hypothesis for an experiment on factors affecting math grades could be: 'The amount of time spent studying directly affects math grades'. This hypothesis can be tested by tracking students' study times and their corresponding math grades.

In designing an experiment about factors that affect math grades, a possible hypothesis could be: 'The amount of time spent studying directly affects math grades.' This hypothesis is testable and directly relates to the experiment's topic. You could set up an experiment where you track a group of students' math grades and measure the amount of time they dedicate to studying math. If those who study more have better math grades, your hypothesis would be supported.

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The statement for flat iron temperature is "450°F (i.e., 230°C)."

Temperature is the measurement of a body's level of hotness or coolness.

The average kinetic energy of the system is measured by temperature. The kinetic energy of particles in a matter raises as they move faster, which boosts the temperature of the system. When two bodies of differing temperatures come into touch, heat is the energy exchanged between them.

Fine hair strands should be kept at 350–375 degrees Fahrenheit , whereas coarse or thick hair should be at 400–450 degrees Fahrenheit.

Wavy hair can become flat due to heat damage, losing the texture. For some context, 450 degrees Fahrenheit is the temperature at which semi-permanent keratin straightening procedures are performed.

Chelsea should set her flat iron to 450 degrees Fahrenheit, that is 230 degrees Celsius after applying the keratin treatment on Kimi's hair and blow drying it.

Hence, the correct answer is 450°F (i.e., 230°C).

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3823.36 kPa will be the pressure be when the  temperature reaches 928°C.

Explanation:

Data given of aerosol can:

Gas stored at a temperature T1 = 25 °C

pressure of the gas = 103 kPa OR 1.01 atm

If can thrown in fire then temperature T2 = 928 ° C

final pressure when can thrown in fire, P2 =?

Gay Lussac Law is applied to know the final volume:

[tex]\frac{P1}{T1}[/tex] = [tex]\frac{P2}{T2}[/tex]

rearranging the equation:

P2 = [tex]\frac{P1T2}{T1}[/tex]

putting the values in the equation:

P2 = [tex]\frac{1.01 X 928}{25}[/tex]

P2 = 37. 49 atm

The pressure will reach 37.49 atm or 3823.36 kPa is the pressure when it is thrown in the fire having temperature of 928 degree celsius.

Answer:

D) 40

Explanation:

The number of sex chromosomes in an organism is half the number of chromosomes the individual has.

So if the individual has 80 chromosomes, they’ll have 80/2 =40 sex chromosomes.

Answer:

A)2

Explanation:

Answer:

6.60 L

Explanation:

3.13 mol * 5.29 L / 2.51 mol = 6.59669323 liters but sig figs so 6.60 L

The volume of the balloon after adding the extra argon gas is approximately 11.89 liters.

To determine the volume of the balloon after adding the extra argon gas, we can use the concept of the ideal gas law, which states:

PV = nRT

where:

-  P  is the pressure

-  V  is the volume

-  n  is the number of moles

-  R  is the ideal gas constant

-  T  is the temperature

Since the problem doesn't specify changes in pressure or temperature, we'll assume they remain constant. Therefore, the volume is directly proportional to the number of moles of gas ( [tex]V \propto n[/tex] ).

Initially, the balloon contains 2.51 moles of argon in 5.29 liters.

We can set up the proportional relationship:

[tex]\frac{V_1}{n_1} = \frac{V_2}{n_2}[/tex]

Given:

-  V₁ = 5.29  liters

-  n₁ = 2.51  moles

-  n₂ = 2.51 + 3.13 = 5.64  moles

We need to find  V₂ :

[tex]\frac{5.29 \, \text{L}}{2.51 \, \text{moles}} = \frac{V_2}{5.64 \, \text{moles}}[/tex]

Solving for  V₂ :

[tex]V_2 = \frac{5.29 \, \text{L} \times 5.64 \, \text{moles}}{2.51 \, \text{moles}} \\\\V_2 = \frac{29.8356 \, \text{L} \cdot \text{moles}}{2.51 \, \text{moles}} \\\\V_2 \approx 11.89 \, \text{L}[/tex]

Therefore, the volume of the balloon after adding the extra argon gas is approximately 11.89 liters.

Answer: The answers are

1) 200g

2) 100g per liter

3) unsaturated

4) 300

Explanation:

At 60°C, 200g must be added to 1 L of water to make a saturated solution. [Observing the graph we can see that at 60, 200g must be added]

At 25°C, the solubility is about 100 per L. [Observing the given graph]

A solution that contains 600g BaNO3 in 3L of H20 at 70°C is saturated.[By knowing the definition of Saturated solution]

For a solution that contains 300 g BaNO3 in 3L of H20 at 60°C to become saturated, 300g soluted must be added.

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Answer:

The structure

Enzymes allow

Enzymes blind

Emzymes increase

Explanation:

Enzymes are biological catalysts that are essential to the functioning of living things. They are able to adapt their structure in response to various circumstances, which allows them to perform catalytic tasks with flexibility.

One enzyme can catalyse a wide variety of processes, which adds to the metabolic flexibility. Through feedback mechanisms, enzymes give organisms the ability to control physiological circumstances and maintain homeostasis.

Enzymes increase reaction speeds by lowering activation energy barriers by precisely binding to particular substrates. Cells can function well thanks to this catalytic process.

Thus, on the contrary, enzymes reduce the activation energy, speeding up processes. Enzymes are dynamic organisms at the centre of biological processes that expertly direct molecular changes.

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Answer : The molality of sodium chloride is, 1.79 m

Explanation :

To calculate the molality of solution, we use the equation:

[tex]\text{Molality}=\frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ (in grams)}}[/tex]

Where,

[tex]m_{solute}[/tex] = Given mass of solute (sodium chloride) = 49 g

[tex]M_{solute}[/tex] = Molar mass of solute (sodium chloride) = 58.5 g/mol

[tex]W_{solvent}[/tex] = Mass of solvent (water) = 469 g

Now put all the given values in above equation, we get:

[tex]\text{Molality of }NaCl=\frac{49g\times 1000}{58.5g/mol\times 469kg}\\\\\text{Molality of }NaCl=1.79mol/kg=1.79m[/tex]

Hence, the molality of sodium chloride is, 1.79 m

1.00 mole of chlorine gas contains 1.20442815×10²⁴ atoms of chlorine.

The subject of this question is chemistry, specifically moles and atoms. In chemistry, a mole is a unit used to talk about a very large number of things — approximately 6.02214076×10²³, which is known as Avogadro's Number. When you have 1.00 mole of something, you have 6.02214076×10²³ of it. This means that 1.00 mol of chlorine gas (Cl₂) contains 2.00 moles of chlorine atoms. Therefore, 1.00 mol of chlorine gas contains 2.00 x 6.02214076×10²³ = 1.20442815×10²⁴ atoms of chlorine.

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Final answer:

In 1.00 mol of chlorine gas, which is diatomic (Cl₂), there are 1.2044 × 10²´ atoms of chlorine, as one mole of Cl₂ contains 6.022 × 10²³ molecules, and each molecule has two chlorine atoms.

Explanation:

To determine how many atoms of chlorine are in 1.00 mol of chlorine gas (Cl₂), we must understand the molecular composition of chlorine gas. Chlorine gas is diatomic, which means each molecule consists of two chlorine atoms. According to Avogadro's number, one mole of any substance contains 6.022 × 10²³ entities (atoms, molecules, etc.). Thus, in 1 mole of Cl₂, there are 6.022 × 10²³ molecules of Cl₂.

Since each Cl₂ molecule contains two chlorine atoms, to find the total number of chlorine atoms in one mole of Cl₂, we simply multiply Avogadro's number by two:

6.022 × 10²³ molecules/mol × 2 atoms/molecule = 1.2044 × 10²´ atoms of chlorine.

Therefore, 1.00 mol of chlorine gas contains 1.2044 × 10²´ atoms of chlorine.

Answer:

Compounds with Carbonate ions are less soluble than the compounds with Chlorate ions.

Explanation:

The reason is that the compounds with carbonate ions have less attraction between positive and negative charges. (Solvation)

Answer:

81.3%

Explanation:

Step 1:

The balanced equation for the reaction:

This is shown below:

C3H8 + 5O2 —> 3CO2 + 4H2O

Step 2:

Data obtained from the question. This includes:

Mass of propane (C3H8) = 470 g

Actual yield of water (H2O) = 625 g

Percentage yield of water (H2O) =?

Step 3:

Determination of the mass of propane (C3H8) burned and the mass of water (H2O) produce from the balanced equation. This is illustrated below:

C3H8 + 5O2 —> 3CO2 + 4H2O

Molar Mass of C3H8 = (3x12) + (8x1) = 36 + 8 = 44g/mol

Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/mol

Mass of H2O from the balanced equation = 4 x 18 = 72g

From the balanced equation above,

44g of C3H8 was burned and 72g of H2O was produced.

Step 4:

Determination of the theoretical yield of H2O. This is illustrated below:

From the balanced equation above,

44g of C3H8 produced 72g of H2O.

Therefore, 470g of C3H8 will produce = (470x72)/44 = 769.09g of H2O.

Therefore, the theoretical yield of H2O is 769.09g

Step 5:

Determination of the percentage yield of water (H2O). This is illustrated below:

Actual yield of water (H2O) = 625g

theoretical yield of H2O = 769.09g

Percentage yield of water (H2O) =?

Percentage yield = Actual yield/Theoretical yield x100

Percentage yield = 625/769.09 x100

Percentage yield = 81.3%

Therefore, the percentage yield of water (H2O) is 81.3%

Final answer:

The percent yield of water produced during the combustion of propane is calculated as the actual yield divided by the theoretical yield, multiplied by 100. Using stoichiometry, it is determined to be 81.35%.

Explanation:

The question is about the percent yield of water produced during the combustion of propane. The formula to calculate percent yield is actual yield divided by theoretical yield, multiplied by 100. First, we must establish the theoretical yield of water in moles. Propane has a molar mass of approximately 44.1 g/mol, so 470 grams of propane is equivalent to approximately 10.657 moles (470g / 44.1g/mol). The balanced equation states there are 4 moles of water produced per mole of propane, which would yield 42.628 moles of water (10.657 moles C3H8 x 4 moles H2O). Since the molar mass of water is about 18.015 g/mol, we multiply the moles of water by its molar mass to find the theoretical yield in grams: 768.311 g (42.628 moles x 18.015 g/mol). With an actual yield of 625 grams, we can now determine the percent yield: (625g / 768.311g) x 100% = 81.35%. Therefore, the percent yield of water for the stove is 81.35%.

Answer:

C) The equation is balanced for nitrogen atoms only

Explanation:

nitrogen (black one) - 1 before and 1 after reaction

oxygen (white one) - 3 before and 2 after reaction

So,

C) The equation is balanced for nitrogen atoms only

Answer:

D) Benzene will not dissolve well in water since non-polar molecules do not dissolve in polar solvents.

Explanation:

Benzene is nonpolar because it is a symmetrical molecule in which all the bond dipoles cancel.

Polar solvents have large dipole moments or partial charge; they contain bonds between atoms with very different electronegativities.

Polar solvents like water cannot dissolve non-polar substances like benzene.

Benzene can only be dissolved by other non-polar solvents like n-hexane, carbon tetrachloride [tex](CCl_{4} )[/tex], e.t.c.

Answer:

A) Index Fossils

Explanation:

Index fossils are fossils used to define and identify geologic periods. Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends.

Answer:

It's C - 6:00PM.

Explanation:

Answer:

1. The heat energy in Joules is 5280.22J

2. The heat energy in calories is 1261.4 calories

Explanation:

Step 1:

Data obtained from the question.

The following data were obtained from the question:

Mass of water (M) = 74.2 g

Initial temperature (T1) = 24°C

Final temperature (T2) = 41°C

Change in temperature (ΔT) = T2 - T1 = 41 - 24 = 17°C

Heat energy (Q) =?

Recall:

Specific heat capacity of water = 4.186 J/g°C

Step 2:

Determination of the energy in Joules.

This is illustrated below:

Q = MCΔT

Q = 74.2 x 4.186 x 17

Q = 5280.22J

Step 3:

Conversion of the heat energy in Joules to calories. This is illustrated below:

4.186 J = 1 calorie

Therefore, 5280.22J = 5280.22/4.186 = 1261.4 calories

Answer:

rolling a 7

Explanation:

Because to roll a 2 you'd need double one's and to roll a 7 you'd need 2 different numbers so you'd have a better chance of rolling 2 different numbers than rolling the same numbers.

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Rolling a total of 7 is more likely than a total of 2 when two dice are rolled because there are more combinations (six) that add up to 7 compared to only one combination that adds up to 2.

Rolling a total of 7 is more likely than rolling a total of 2 when two six-sided dice are rolled. To determine the probability of these outcomes, we must consider all possible combinations that each die can produce. The sum of 7 can be achieved with six different combinations: (1,6), (2,5), (3,4), (4,3), (5,2), and (6,1). On the contrary, the sum of 2 can only be achieved with one combination: (1,1).

Since a fair six-sided die has an equal chance of landing on any one of its faces, each combination above has an equal chance of occurrence. Therefore, the probability of rolling a sum of 7 with two dice is 6/36 (since there are 6 favorable combinations out of a total of 36 possible combinations when two dice are rolled), which simplifies to 1/6. Meanwhile, the probability of rolling a sum of 2 is only 1/36, because there is only one favorable combination.

Hence, rolling a total of 7 has a higher probability than rolling a total of 2, since 1/6 is greater than 1/36.

Answer: 0.075

Explanation:

(concentration in molarity)(volume in liter) = answer

0.15 mol/L *0.500L = 0.075 mol

The number of moles of H2SO4 in the given solution is 0.075 moles.

The question is asking how many moles of H2SO4 are present in 0.500 L of a 0.150 M H2SO4 solution.

To answer this question, we can use the equation:

Moles of solute = concentration (M) x volume (L)

In this case, the concentration is 0.150 M and the volume is 0.500 L. Plugging these values into the equation, we get:

Moles of H2SO4 = 0.150 M x 0.500 L = 0.075 mol

Therefore, there are 0.075 moles of H2SO4 present in 0.500 L of the solution.

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Answer:

Flat plains because when the magma flies out the spews out the volcano it will  sinks to the ocean floor it rise and then once more eruptions come the magma will form with land that was previously there.

Explanation:

Answer:

B. Hydrogen

Explanation:

Answer:

B. Hydrogen

Explanation:

The most abundant gas is hydrogen which is fuel used by stars to create energy.

The answer for the following problem is mentioned below.

Explanation:

Molarity:

The no of moles of moles present in one litre of the solution is called molarity

Given:

molarity of magnesium chloride (m) = 0.005 M

volume of magnesium chloride solution (V) = 261.5 ml

To find:

no of moles of magnesium chloride solution (n)

We know;

molarity = [tex]\frac{n}{V}[/tex]

m =  [tex]\frac{n}{V}[/tex]

where;

m represents the molarity of the magnesium chloride solution

n represents the no of moles of magnesium chloride solution

V represents the volume of magnesium chloride solution

So;

0.005 = [tex]\frac{n}{261.5}[/tex]

n = 0.005 × 261.5

n = 1.3075 moles

Therefore the no of moles in the magnesium chloride solution is 1.3075 moles.

Answer:

B. They help some kinds of fish migrate past dam barriers.

Explanation:

Description

A fish ladder, also known as a fishway, fish pass or fish steps, is a structure on or around artificial and natural barriers (such as dams and waterfalls) so as to enhance diadromous fishes' natural migration as well as movements of potamodromous species.

Answer:

Examine the multiple bond for cis- and trans- isomers.

Explanation:

Answer:

B. Examine the multiple bond for cis- and trans- isomers.

Explanation:

Answer:

any thing under 212 degrees Fahrenheit

Explanation:

the boiling point of water is 212 degrees Fahrenheit so any thing below this would be a non example.