The total mass of the products can be determined by using the stoichiometry of the chemical reaction. According to the balanced equation, 1 mole of CaCO3 produces 1 mole of CO2 and 1 mole of CaO.
To find the molar mass of CaCO3, we add the atomic masses of calcium (Ca), carbon (C), and three oxygen (O) atoms:
Ca = 40.08 g/mol
C = 12.01 g/mol
O = 16.00 g/mol
Molar mass of CaCO3 = (40.08 g/mol) + (12.01 g/mol) + (16.00 g/mol x 3) = 100.09 g/mol
Given that 30 grams of CaCO3 is used, we can calculate the number of moles:
30 g / (100.09 g/mol) = 0.2998 mol
Since the stoichiometry of the reaction shows a 1:1 ratio between CaCO3 and the products CO2 and CaO, the number of moles of CO2 and CaO will also be 0.2998 mol.
To find the mass of the products, we multiply the number of moles by their respective molar masses:
Mass of CO2 = 0.2998 mol x (44.01 g/mol) = 13.20 g
Mass of CaO = 0.2998 mol x (56.08 g/mol) = 16.81 g
Therefore, the total mass of the products, CO2 and CaO, is:
13.20 g + 16.81 g = 29.01 g
Rounded to the nearest gram, the total mass of the products is 29 grams. Therefore, the correct answer is:
30 grams
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
10 grams
10 grams
60 grams
5 answers
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 are lost.
They are lost.
They gain mass.
They gain mass.
They maintain their properties.
4Fe+3O2→2Fe2O3
What happens to atoms of Fe and O2 during the reaction?
(1 point)
Responses
They are rearranged.
They are rearranged.
They are lost.
They are lost.
They gain mass.
They gain mass.
They maintain their properties.
Atoms of Fe and O2 are rearranged during the reaction. In the reactants, Fe is combined with O2 to form the product Fe2O3, where the atoms of Fe and O2 are rearranged to create a new compound. Therefore, the correct answer is:
They are rearranged.
They are rearranged.
Which is most likely to occur during a chemical reaction?(1 point)
Responses
New atoms are created.
New atoms are created.
Mass is conserved.
Mass is conserved.
Atoms of the original substance are lost.
Atoms of the original substance are lost.
The original substance maintains its properties.
Responses
New atoms are created.
New atoms are created.
Mass is conserved.
Mass is conserved.
Atoms of the original substance are lost.
Atoms of the original substance are lost.
The original substance maintains its properties.
Mass is conserved during a chemical reaction. According to the law of conservation of mass, the mass of the reactants in a chemical reaction is equal to the mass of the products. Therefore, the correct answer is:
Mass is conserved.
Mass is conserved.
1 answer