7. Convert 158 g of C to moles.

Number of mole = 13.155moles

Explanation:

One mole of a substance is equal to 6.022 * 10^23 units of that substance.

Mole of a substance can be defined according to chemistry as the mass of substance containing the same number of fundamental units

Using the formula for mole

n = m/Mm

n = number of mole

m = number of mass

Mm = number of molar mass

We are provided with some information

Given: mass of carbon to be 158g

Molar mass of C = 12.0107g/mol

Using the formula

n = m/Mm

n = 158 / 12.0107

n = 13.155 moles