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
10 grams
10 grams
60 grams
60 grams
15 grams
15 grams
30 grams
The total mass of the products can be determined by calculating the molar masses of each product and adding them together.
The molar mass of CO2 is 44 grams/mol, and the molar mass of CaO is 56 grams/mol.
To find the total mass of the products, we need to consider the ratio in which they are produced. From the balanced chemical equation, we can see that for every 1 mole of CaCO3, 1 mole of CO2 and 1 mole of CaO are produced.
The molar mass of CaCO3 is 100 grams/mol.
Given that the scientist used 30 grams of CaCO3, we can calculate the moles of CaCO3 used:
moles CaCO3 = mass CaCO3 / molar mass CaCO3
moles CaCO3 = 30 g / 100 g/mol
moles CaCO3 = 0.3 moles
Since the stoichiometry of the reaction indicates that 1 mole of CaCO3 produces 1 mole of CO2 and 1 mole of CaO, we can determine the moles of CO2 and CaO produced:
moles CO2 = 0.3 moles
moles CaO = 0.3 moles
Finally, we can calculate the mass of CO2 and CaO produced using their respective molar masses:
mass CO2 = moles CO2 * molar mass CO2
mass CO2 = 0.3 moles * 44 g/mol
mass CO2 = 13.2 grams
mass CaO = moles CaO * molar mass CaO
mass CaO = 0.3 moles * 56 g/mol
mass CaO = 16.8 grams
Therefore, the total mass of the products is the sum of the mass of CO2 and the mass of CaO:
Total mass = mass CO2 + mass CaO
Total mass = 13.2 grams + 16.8 grams
Total mass = 30 grams
The total mass of the products is 30 grams.
Use the chemical reaction to answer the question.
4Fe+3O2→2Fe2O3
What happens to atoms of Fe and O2 during the reaction?
(1 point)
Responses
They are rearranged.
They are rearranged.
They maintain their properties.
They maintain their properties.
They gain mass.
They gain mass.
They are lost.
They are rearranged.
Which is most likely to occur during a chemical reaction?(1 point)
Responses
Mass is conserved.
Mass is conserved.
Atoms of the original substance are lost.
Atoms of the original substance are lost.
New atoms are created.
New atoms are created.
The original substance maintains its properties.
Mass is conserved.
Use the chemical reaction to answer the question.
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
Atoms of Na are destroyed during the reaction.
Atoms of Na are destroyed during the reaction.
There are more H atoms after the reaction.
There are more H atoms after the reaction.
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.
Use the chemical reaction to answer the question.
2H2+O2→2H2O
There are four atoms of hydrogen ( H
) before the reaction. How many atoms of hydrogen are present after the reaction?
(1 point)
Responses
8
8
2
2
4
4
5
There are 4 atoms of hydrogen present after the reaction.
To find the total mass of the products, we need to first calculate the molar mass of each product and then use stoichiometry to determine the mass.
The balanced chemical equation is:
CaCO3 → CO2 + CaO
The molar mass of CaCO3 is 40.08 g/mol (calcium = 40.08 g/mol, carbon = 12.01 g/mol, oxygen = 16.00 g/mol).
The molar mass of CO2 is 44.01 g/mol (carbon = 12.01 g/mol, oxygen = 16.00 g/mol).
The molar mass of CaO is 56.08 g/mol (calcium = 40.08 g/mol, oxygen = 16.00 g/mol).
Given that the scientist heats 30 grams of calcium carbonate (CaCO3), we can calculate the mass of CO2 and CaO produced.
We start by finding the moles of CaCO3:
moles = mass / molar mass
moles = 30 g / 100.09 g/mol
moles = 0.2998 mol
From the balanced equation, we can see that for every 1 mole of CaCO3, 1 mole of CO2 is produced. Therefore, the moles of CO2 produced will also be 0.2998 mol.
The molar mass of CO2 is 44.01 g/mol, so we can calculate the mass of CO2:
mass of CO2 = moles of CO2 * molar mass of CO2
mass of CO2 = 0.2998 mol * 44.01 g/mol
mass of CO2 = 13.18 g
Similarly, for every 1 mole of CaCO3, 1 mole of CaO is produced. Therefore, the moles of CaO produced will also be 0.2998 mol.
The molar mass of CaO is 56.08 g/mol, so we can calculate the mass of CaO:
mass of CaO = moles of CaO * molar mass of CaO
mass of CaO = 0.2998 mol * 56.08 g/mol
mass of CaO = 16.82 g
Therefore, the total mass of the products (CO2 + CaO) is:
total mass = mass of CO2 + mass of CaO
total mass = 13.18 g + 16.82 g
total mass = 30 grams
So the total mass of the products is 30 grams.