Question

Difference between 1 gram & per gram

Answer 1

1 gram is measurement and of weight

per gram means measuring some other quantities in the frame of reference of weight

weight of key=1 gram

moles of iron in key per gram= 2 mol

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Answer 2

Gram (measure): A unit of measurement of weight and mass in the metric system. In weight, a gram is equal to a thousandth of a kilogram. In mass, a gram is equal to a thousandth of a liter (one cubic centimeter) of water at 4 degrees centigrade. ... Its symbol is g.