Use the chemical reaction to answer the question.

​CaCO3→CO2​+CaO
A scientist heats 30 grams of calcium carbonate (CaCO3
) in the chemical reaction shown. What is the total mass of the products?

(1 point)

11 answers

The total mass of the products can be determined by calculating the molar masses of each product and summing them up.

The molar mass of CO2 is 44.01 g/mol, and the molar mass of CaO is 56.08 g/mol.

To calculate the mass of CO2 produced, we need to convert the mass of CaCO3 to moles and then multiply by the molar mass of CO2.

Moles of CaCO3 = mass of CaCO3 / molar mass of CaCO3
Moles of CaCO3 = 30 g / 100.09 g/mol (molar mass of CaCO3)
Moles of CaCO3 = 0.2997 mol

Using the stoichiometric coefficient in the balanced chemical equation (1:1 ratio), we can determine the moles of CO2 produced.

Moles of CO2 = moles of CaCO3 = 0.2997 mol

Finally, we can calculate the mass of CO2 produced.

Mass of CO2 = moles of CO2 * molar mass of CO2
Mass of CO2 = 0.2997 mol * 44.01 g/mol
Mass of CO2 = 13.178 g

Now we need to calculate the mass of CaO produced.

Moles of CaO = moles of CaCO3 = 0.2997 mol

Finally, we can calculate the mass of CaO produced.

Mass of CaO = moles of CaO * molar mass of CaO
Mass of CaO = 0.2997 mol * 56.08 g/mol
Mass of CaO = 16.839 g

Therefore, the total mass of the products (CO2 and CaO) is:

Mass of CO2 + Mass of CaO = 13.178 g + 16.839 g = 29.017 g.
Chemical Reactions Quick Check
1 of 51 of 5 Items
Question
Use the chemical reaction to answer the question.

​CaCO3→CO2​+CaO
A scientist heats 30 grams of calcium carbonate (CaCO3
) in the chemical reaction shown. What is the total mass of the products?

(1 point)
Responses

15 grams
15 grams

30 grams
30 grams

60 grams
60 grams

10 grams
The correct answer is 60 grams.
Chemical Reactions Quick Check
2 of 52 of 5 Items

Question
Use the chemical reaction to answer the question.

4​Fe+3O2→2Fe2O3​
What happens to atoms of Fe and O2 during the reaction?

(1 point)
Responses

They are rearranged.
They are rearranged.

They gain mass.
They gain mass.

They are lost.
They are lost.

They maintain their properties.
The correct answer is:

They are rearranged.
Which is most likely to occur during a chemical reaction?(1 point)
Responses

Mass is conserved.
Mass is conserved.

The original substance maintains its properties.
The original substance maintains its properties.

New atoms are created.
New atoms are created.

Atoms of the original substance are lost.
The correct answer is:

Mass is conserved.
NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2
A student mixes baking soda (NaHCO3
) and acetic acid (HC2H3O2
) to produce a chemical reaction shown. Which statement about the reaction is correct?

(1 point)
Responses

Some atoms gain mass after the reaction.
Some atoms gain mass after the reaction.

The atoms of the reactants are regrouped during the reaction.
The atoms of the reactants are regrouped during the reaction.

There are more H atoms after the reaction.
There are more H atoms after the reaction.

Atoms of Na are destroyed during the reaction.
The correct answer is:

The atoms of the reactants are regrouped during the reaction.
There are four atoms of hydrogen (H
) before the reaction. How many atoms of hydrogen are present after the reaction?

(1 point)
Responses

4
4

2
2

5
5

8
Before the reaction, there are four atoms of hydrogen (H). After the reaction, there are still four atoms of hydrogen (H).

The correct answer is: 4.
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