How many grams of sodium are in 50 grams of NaBr

Question

It is chemical quantities

Answer 1

Since you are studying "chemical quantities" in your chemistry class, you are probably supposed to use dimensional analysis.  The previous answer is indeed correct, and well explained, but to put it into the context of chemical quantities and to use dimensional analysis, you might want to look at the following:

Na = 22.99 g/mol

Br = 79.9 g/mol

NaBr = 102.89 g/mole

 

50 g NaBr x 1 mole NaBr/102.89 g NaBr x 1 mole Na/mole NaBr x 22.99 g Na/mole Na = 11.2 g Na = 11 g Na (to 2 sig figs).

Answer 2

I will tell you how to solve this, and you do the math.

 

Find the atomic weights (in grams per mole) of Na and Br in your chemistry book, and add them together.  That will be the molecular weight of NaBr.  

 

Divide the given mass of 50 grams by the molecular weight of NaBr.  That gives the number of moles of NaBr, which also equals the number of moles of Na.

 

Multiply the number of moles of Na by the atomic weight of Na, and that will be the number of grams of Na.