Question

calculate the percentage Composition of "calcium nitrate".​

Answer 1

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Step 1: Determine the total mass of each element in the molar mass

1 mol Ca x (40.08gCa/1 mol Ca) = 40.08 g Ca

2 mol N x (14.01gN/1 mol N) = 28.02 g N

6 mol O x (16.00gO/1 mol O) = 96.00 g O

1 mol of Ca(NO3)2 = 164.1 g (molar mass)

Step 2: Calculate percent by multiplying the mass ratio by 100%

%Ca = (40.08gCa/164.1 Ca(NO3)2) x 100 = 24.42%

%N = (28.02gN/164.1 Ca(NO3)2) x 100 = 17.07%

%O = (96.00gO/164.1 Ca(NO3)2) x 100 = 58.50%

Answer 2

Explanation:

Molecular mass of Ca(NO3)2= 40+14×2+16×3×2

40+28+96

164

% of Ca= 40g

-------×100= 24.4%

164g

% of N= 28g

--------×100= 17.1%

164g

% of O= 96g

-------×100=58.5%

164g