Calculating mass of number of moles.

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How do u calculate number of moles in compound

Mass (g) / Relative formula mass Mr

How do we calculate mass of a number of moles

Mass (g) = number of moles x relative formula mass Mr

Calculate mass of four moles of sodium chloride NaCl

Work out mr of NaCl ( 1×23) + (1×35.5) = 58.5

mass (g) = 4 × 58.5 = 234g

Calculate mass of three moles of potassium oxide K2O

Mr = (2×39) + (1×16) = 94

mass = 3 × 94

mass = 282 g