Question

The molar mass of O₂ is 32.00 g/mol. How many moles of HgO are needed to produce 250.0 g of O₂?

A. 3.906 moles
B. 7.813 moles
C. 15.63 moles
D. 73.87 moles

Answer 1

To find the number of moles of HgO needed to produce 250.0 g of O₂, you can use the molar mass of O₂ to convert grams to moles. The answer is (D) 7.813 moles of HgO.

Step-by-step explanation:

To find the number of moles of HgO needed to produce 250.0 g of O₂, we can use the molar mass of O₂ to convert grams to moles. The molar mass of O₂ is 32.00 g/mol, which means that 1 mole of O₂ has a mass of 32.00 grams. So, we can use the following conversion factor:

1 mole of O₂ / 32.00 g O₂

To find how many moles of HgO are needed, we can set up the following proportion:

(250.0 g O₂) * (1 mole of O₂ / 32.00 g O₂) = x moles of HgO

Solving for x, we find that x = 7.813 moles of HgO.