What is the percent composition of 1 molar mass of NaBr? Select one: O a. 30.27%...

Question

Question

What is the percent composition of 1 molar mass of NaBr? Select one: O a. 30.27% Sodium and 69.73% Bromine b. 22.34% Sodium a

Answer 1

Answer #1

Molar mass of NaBr,

MM = 1*MM(Na) + 1*MM(Br)

= 1*22.99 + 1*79.9

= 102.89 g/mol

Lets calculate the mass of each element

mass of Na = 1*MM(Na)

= 22.99 g

mass of Br = 1*MM(Br)

= 79.9 g

mass % = (mass of element *100)/molar mass of compound

Now calculate mass percent of each element

Mass % of Na = (22.99*100)/102.89

= 22.34 %

Mass % of Br = (79.9*100)/102.89

= 77.66 %

Answer: b

Answer 2

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