7. What is the mass in grams of 67mol of nitrogen dioxide. NO?

2.23 grams

Explanation:

Nitrogen dioxide is an oxide of nitrogen with a chemical formula of NO.

Given that:

mass in grams of NO = ?

Number of moles of NO = 67mol

Molar mass of nitrogen dioxide NO, use the atomic mass of nitrogen = 14g; Oxygen = 16g

NO = (14g + 16g) = 30g/mol

Now, apply the formula:

Number of moles = (Mass in grams / Molar mass)

67 moles = (Mass / 30g/mol)

Mass = (67moles/30g/mol)

Mass = 2.23 grams

Thus, there are 2.23 grams of Nitrogen dioxide present