Question

(a) Determine the number of atoms for each element present in the following molecule: Na2CO3
(b) Using the periodic table of elements, determine the molar mass for this molecule . Show your work:

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a) Determine the number of atoms for each element present in the following molecule: Na2CO3 .
(b) Using the periodic table of elements, determine the molar mass for this molecule

Answer 1

"sodium carbonate (also known as washing soda or soda ash), Na2CO3 is a sodium salt of carbonic acid. It most commonly occurs as a crystalline heptahydrate."
Your question does not specify whether the compound is in its hydrated form or not.
The hydrated form would have the following formula: Na2CO3•7H2O. If we assume it is in its anhydrous form, its formula would be Na2CO3.
First, we need to find the gram-formula mass of Na2CO3:
2 × Na = 2 × 22.9898 = 45.9796
1 × C = 1 × 12.0111 = 12.0111
3 × O = 3 × 15.9994 = 47.9982
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Total = 105.9901 g/mol