Question

Calculate the number of moles in 6.52 g of each of the following:

Part A He Express your answer with the appropriate units. n = Value Units

Part B SnO2 Express your answer with the appropriate units. n = Value Units

Part C Cr(OH)3 Express your answer with the appropriate units. n = Value Units

Part D Ca3N2 Express your answer with the appropriate units.

Answer 1

formula for the no of moles = weight in grams / molar mass in gram/mole

weight is common fo rall the substances

Part A

no of moles He = 6.52 g / 4.0026 g/mole ( He molar mass = 4.0026)

= 1.63 mole

PartB

no of moles of SnO2 = 6.52g / 150.71 g/mole ( SnO2 molar mass = 150.71)

= 0.0433 moles

Part C

no of moles of Cr(OH)3 = 6.52g / 103.02 g/mole ( Cr(OH)3 molar mass = 103.02)

= 0.0633 moles

Part D

no of moles of Ca3N2 = 6.52g / 148.25 g/mole ( Ca3N2 molar mass = 148.25)

= 0.044 moles