Question

The atomic mass of carbon is 12.01, sodium is 22.99, and oxygen is 16.00. What is the molar mass of sodium oxalate (Na2C2O4)?

134.00g
133.00 g
50.91 g
66.91 g
121.81 g

Answer 1

@HuskyNation

Answer 2

Since you already know the atomic masses for each individual atom, this problem is merely a matter of addition and multiplication.

-Since there are two Na's, you multiply the atomic mass of Na by two. 22.99(2) = 45.98

-Same thing for Carbon. 12(2) = 24

-Since there are four oxygen's, you multiply the atomic mass by four. 16(4) = 64

Now just add your products together:

45.98 + 64 + 24 = 133.98 g which you can round to 134.00g.

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