Question

The number of carbon atoms in 10 g CaCO3

• A. 6.022 x 10 ²²
• B. 6.022 x 10 ²¹
• C. 6.022 x 10 ²⁰
• D. 6.022 x 10 ²³

Answer 1

Answer:

A. 6.022 x 10 ²²

Step 1: Calculate the molar mass of CaCO3

The molar mass of CaCO3 is 100 g/mol (40 g/mol for Ca, 12 g/mol for C, and 48 g/mol for three O atoms).

Step 2: Calculate the number of moles of CaCO3 in 10 g

Number of moles = mass / molar mass = 10 g / 100 g/mol = 0.1 mol.

Step 3: Calculate the number of carbon atoms in 0.1 mol of CaCO3

One mole of CaCO3 contains 1 mole of carbon atoms (6.022 x 10²³ atoms). Therefore, 0.1 mol of CaCO3 contains 0.1 x 6.022 x 10²³ carbon atoms.

Step 4: Calculate the number of carbon atoms

Number of carbon atoms = 0.1 x 6.022 x 10^23 = 6.022 x 10²² atoms.

The final answer is: 6.022 x 10²²