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1) what is percent by mass of sodium of bicarbonate in a solution containing 20g NaHCO³ dissolved in 100g of water?

2) What is the percent by mass if 8g copper is added to zinc to producr 100g of aloy?

3) What is the percent by mass concentration of a solution that contains 30g of salt dissolved in 300g of water?

WITH SOLUTION


Sagot :