Skill 3-3 Mass Percent and the Chemical Formula
12
The formula shows the number of moles of each element; use it to calculate the mass percent of each element on a mole basis:
Problem: The formula of the sugar glucose is C6 H12O6.
(a) What is the mass percent of each element in glucose?
(b) How many grams of carbon are in 16.55 g glucose?
Plan: The formula gives the no. of moles of C, H and O in glucose. Convert from moles of element to grams using the molar mass.
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