Which compound has a molar mass of 213 g/mol?  Group of answer choicesMgCO3K2SO4Ca(NO3)2Al(NO3)3

To find the compound with a molar mass of 213 g/mol, we need to calculate the molar mass of each compound.

1. MgCO3: The molar mass of Mg is 24.305 g/mol, C is 12.01 g/mol, and O is 16.00 g/mol. So, the molar mass of MgCO3 is 24.305 + 12.01 + (3*16.00) = 84.315 g/mol.

2. K2SO4: The molar mass of K is 39.098 g/mol, S is 32.06 g/mol, and O is 16.00 g/mol. So, the molar mass of K2SO4 is (239.098) + 32.06 + (416.00) = 174.256 g/mol.

3. Ca(NO3)2: The molar mass of Ca is 40.078 g/mol, N is 14.007 g/mol, and O is 16.00 g/mol. So, the molar mass of Ca(NO3)2 is 40.078 + (2*(14.007 + (3*16.00))) = 164.088 g/mol.

4. Al(NO3)3: The molar mass of Al is 26.982 g/mol, N is 14.007 g/mol, and O is 16.00 g/mol. So, the molar mass of Al(NO3)3 is 26.982 + (3*(14.007 + (3*16.00))) = 212.996 g/mol, which is approximately 213 g/mol.

So, the compound with a molar mass of 213 g/mol is Al(NO3)3.