Express the mass in grams to three significant figures.

Question

Ascorbic acid, or vitamin C (C6H8O6, molar mass = 176 g/mol), is a naturally occurring organic compound with antioxidant properties. A healthy adult’s daily requirement of vitamin C is 70-90 mg. A sweet lime contains 2.88×10−4 mol of ascorbic acid.

To determine whether the ascorbic acid in a sweet lime meets the daily requirement, calculate the mass of ascorbic acid in 2.88×10−4 mol of ascorbic acid.

Answer 1

Hello, Anya,

Check the steps in the table below. We can calculate the C6H8O6 mass in a sweet lime by converting the moles to grams. But the question is in mg, so multiply the grams by 1000 to get the 50.7 mg figure. Not enough to meet the daily requirement. (I didn't watch sig figs, but 3 looks correct).

Bob