370.5

# Given that sodium chloride is 39.0% sodium by mass, how many grams of sodium chloride are needed to have 950mg of Na present?

Change word problem to mathematical formula.

100% is to 39% as X is to 950

Or 100/39 = X/950 Multiply both sides by 950 to isolate X and then do division on left side

100% is to 39% as X is to 950

Or 100/39 = X/950 Multiply both sides by 950 to isolate X and then do division on left side