If there are 87.3 grams in a sample of K2Cr207, how many moles would this be?

Number of moles = 0.297 mol

Explanation:

Given data:

Mass of K₂Cr₂O₇ = 87.3 g

Number of moles = ?

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of K₂Cr₂O₇ 294.185 g/mol

By putting values,

Number of moles = 87.3 g/ 294.185 g/mol

Number of moles = 0.297 mol