Question

Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is Zn2+(aq)+2e−→Zn(s) For a large batch of nails, a manufacturer needs to plate a total zinc mass of 3.40 kg on the surface to get adequate coverage. Part A How many moles of zinc are in 3.40 kg of zinc? Express your answer to three significant figures and include the appropriate units.

Answer 1

Answer:

52.0 moles

Explanation:

no. of moles of Zn =$\frac{mass}{molar mass}=\frac{3400g}{65.38g/mol}=52.0mol$

The important part in this question is changing the kilograms to grams so that the units of the mass(grams) are divisible by the units of the molar mass (grams/molar mass)