What is the molar mass of Na2SO4?A.71.05 g/molB.238.22 g/molC.142.04 g/molD.94.04 g/molSUBMITarrow_backPREVIOUS
Question
What is the molar mass of Na2SO4?
A. 71.05 g/mol
B. 238.22 g/mol
C. 142.04 g/mol
D. 94.04 g/mol
SUBMIT
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Solution
The molar mass of a compound is calculated by adding up the molar mass of each element in the compound.
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Sodium (Na) has a molar mass of approximately 22.99 g/mol. Since there are two sodium atoms in Na2SO4, the total molar mass for sodium is 2 * 22.99 = 45.98 g/mol.
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Sulfur (S) has a molar mass of approximately 32.06 g/mol. Since there is one sulfur atom in Na2SO4, the total molar mass for sulfur is 32.06 g/mol.
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Oxygen (O) has a molar mass of approximately 16.00 g/mol. Since there are four oxygen atoms in Na2SO4, the total molar mass for oxygen is 4 * 16.00 = 64.00 g/mol.
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Add up the molar masses of all the elements to get the molar mass of Na2SO4: 45.98 g/mol (for Na) + 32.06 g/mol (for S) + 64.00 g/mol (for O) = 142.04 g/mol.
So, the molar mass of Na2SO4 is 142.04 g/mol, which corresponds to option C.
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