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A toothpaste contains 0.230 % by mass sodium fluoride used to prevent dental caries and 5.7 % by mass KNO3, which decreases pain sensitivity. One tube contains 119 g of toothpaste.
1) How many grams of sodium ion, Na+, are in 2.50 g of toothpaste? Express your answer using three significant figures.
2) How many KNO3 formula units are in the tube of toothpaste? Express your answer using two significant figures.
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