Question

A piece of solid carbon dioxide with a mass of 7.8 g undergoes sublimation. How many moles of CO₂ gas are produced?

A. 0.2 mol
B. 0.4 mol
C. 0.6 mol
D. 0.8 mol

Answer 1

By using the molar mass of CO₂ (44.01 g/mol) and the provided mass (7.8 g), the calculation yields approximately 0.177 moles of CO₂. The closest given answer is 0.2 mol.

Step-by-step explanation:

To calculate the number of moles of carbon dioxide (CO₂) gas produced from the sublimation of 7.8 g of solid carbon dioxide, we can use the molar mass of CO₂. The molar mass of CO₂ is approximately 44.01 g/mol.

To find the number of moles (n) of CO₂, we use the equation:

n = mass (g) / molar mass (g/mol)

Plugging in the values, we get:

n = 7.8 g / 44.01 g/mol

Doing the math:

n ≈ 0.177 mol of CO₂

Therefore, the closest answer to the choices given is:

B. 0.2 mol