Final answer:
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