only the b part I want to know
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Answer:
a) 48% b) 43%
Explanation:
a) Limestone formula = CaCO3
Mass of Limestone = 40+12+3×16 = 100
Mass of Oxygen in Limestone = 48
Percentage of Oxygen = Mass of O in CaCO3/ Mass of CaCO3×100 = 48/100×100 = 12/25×100 = 48%
b) Washing soda formula = Na2CO3
Mass of washing soda = 2×23+12+3×16 = 106
Mass of Sodium in washing soda = 46
Percentage of Sodium = Mass of Na in Na2CO3/ Mass of Na2CO3 ×100 = 46/106×100 = 23/53×100 = 43%
hope this will help you
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