Question

Calculate the percent composition. 1. NaHCO3

Find emperical formula. 1.) 12.6% Li, 29.2% S, 58.2% O.

How many atoms in the following. 1) 60.5 g of AlCl3

84.6 ML of HCL gas at STP

Answer 1

1)

NaHCO3

MW of Na = 23

MW o fH = 1

MW C = 12

MW O = 16

MW NaHCO3= 84.007

then

% Na = mass of Na/Total Mass * 100 = 23/84.007*100 = 27.3%

% H = mass of H/Total Mass * 100 = 1/84.007*100 = 1.1903%

% C = mass of C/Total Mass * 100 = 12/84.007*100 = 14.284%

% O = mass of O/Total Mass * 100 = 16*3/84.007*100 = 57.1380%

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