which of the following is the mass of one mole of mgso₄?\na 120.4 g\nb 120.4\nc 120.4 g/mol\nd 120.4 mols

Answer

Explanation:

Step1: Identify atomic masses

The atomic mass of Mg (magnesium) is approximately 24.3 g/mol, S (sulfur) is approximately 32.1 g/mol, and O (oxygen) is approximately 16.0 g/mol.

Step2: Calculate molar - mass of MgSO₄

There is 1 Mg, 1 S, and 4 O in MgSO₄. The molar - mass $M$ of MgSO₄ is calculated as follows: $M = 24.3\ g/mol+32.1\ g/mol + 4\times16.0\ g/mol$ $M=24.3\ g/mol + 32.1\ g/mol+64.0\ g/mol$ $M = 120.4\ g/mol$. But we are asked for the mass of one mole. The mass of one mole of a substance is equal to its molar - mass in grams. So the mass of one mole of MgSO₄ is 120.4 g.

Answer:

A. 120.4 g