Question

How do you find the number of moles in a substance?

Answer 1

Answer:

Use the molecular formula to find the molar mass; to obtain the number of moles, divide the mass of compound by the molar mass of the compound expressed in grams.

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Answer 2

Answer:

Explanation:

A mole is defined as the mass of the substance which consists of the equal quantity of basic units. Example atoms in 12 grams are the same as 12C. The basic units can be molecules, atoms or formula units based on the substance. A mole fraction indicates the number of chemical elements. One mole of any substance is equal to the value of 6.023 x 1023 (Avagadro number). It can be used to measure the products obtained from the chemical reaction. The unit is denoted by mol.

The formula for the number of moles formula is expressed as

Number of Moles Formula

Example 1: Determine the number of moles in 95g of MnO2.

Solution:

Given

Mass of MnO2 = 95g

Mass of one mole MnO2 = 86.94g

Number of moles formula is

Number of moles = Mass of substance / Mass of one mole

Number of moles = 95 / 86.94

Number of moles = 1.092 mol

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