A 100-gram sample of sodium chloride (NaCl) consists of 60.66 g of chlorine and 39.34 g of sodium. What mass of sodium would make up a 150-gram sample of sodium chloride?
89.34 g
39.34 g
59.01 g
64.24 g

Question

A 100-gram sample of sodium chloride (NaCl) consists of 60.66 g of chlorine and 39.34 g of sodium. What mass of sodium would make up a 150-gram sample of sodium chloride?
89.34 g
	39.34 g
	59.01 g
	64.24 g

jfraser · Answer

The first set of info is telling you the mass percent of the elements that make up sodium chloride. NaCl is 60.66% sodium, and 39.34% chloride. Any other sample of sodium chloride will have those two elements in the same percentages

So, if the second sample of sodium chloride weighs 150g, the same percentages must still be present. 

(Find 60.66% of 150g)