Question

23 Quizzes on mole concept.

a) Calculate the moles of calcium carbonate ((CaCO_3)) when mass (m = 40) g, (m_textCa = 40), (m_textC = 12), and (m_textO = 16).
b) Determine the mass of (CaCO_3) in the sample.
c) Find the moles of (Ca) in the compound.
d) Calculate the mass of (Ca) in the sample.

Answer 1

To calculate the moles and mass of CaCO3, use the molar mass and given mass. The moles of Ca in CaCO3 can be found using the coefficient. The mass of Ca in the sample can be calculated using the moles and molar mass of Ca.

Step-by-step explanation:

To calculate the moles of CaCO3 when given the mass, you need to use the molar mass of CaCO3. The molar mass is the sum of the atomic masses of each element in the compound. In this case, the molar mass of CaCO3 is (40 g/mol) + (12 g/mol) + (3 * 16 g/mol) = 100 g/mol. To find the moles, divide the given mass by the molar mass: 40 g / (100 g/mol) = 0.4 mol.

To determine the mass of CaCO3 in the sample, multiply the moles by the molar mass: 0.4 mol * (100 g/mol) = 40 g.

To find the moles of Ca in CaCO3, use the coefficient in front of Ca in the chemical formula, which is 1. So, the moles of Ca in CaCO3 is also 0.4 mol.

To calculate the mass of Ca in the sample of CaCO3, multiply the moles of Ca by the molar mass of Ca: 0.4 mol * (40 g/mol) = 16 g.