mass or formula weight. The formula mass of a substance is expressed in atomic m

Question

mass or formula weight. The formula mass of a substance is expressed in atomic mass units or amu. The formula mass is the sum of the atomic masses of all the atoms in its chemical formula. The atomic mass of an atom can be found by using the periodic table. To calculate the formula mass of ethane, use the following steps: formula mass 2(atomic mass of C) 6(atomic mass of H) 2(12.01 amu) 6(1.01 amu) 30.08 amu How to calculate formula mass formula mass Part A What is the formula mass of magnesium chloride, MgCl2? Express your answer to four significant figures and include the appropriate units. Value Units Submit Hints My Answers Give Up Review Part Part B What is the formula mass of ferric sulphate, Fe2(SO4)3? Express your answer to five significant figures and include the appropriate units. Value Units Submit Hints My Answers Give Up Review Part Part C What is the formula mass of butanol, C H9OH? Express your answer to four significant figures and include the appropriate units. Value Units Submit Hints My Answers Give Up Review Part

Explanation / Answer

The molar mass of MgCl2 is 95.211 g/mol

(1 atom of Mg * 24.305 g/mol )+( 2 atoms of Cl2 *70.9060 g/mol)=95.211 g/mol

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Molar mass of Fe2(SO4)3 is 399.8778 g/mol

(2 atom of Fe * 55.845 )+( 3 atoms of s *32.065 g/mol)+(12*15.9994 g/mol)=399.8778 g/mol

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The molar mass of butanol C4H10O is 74.12 g/mol

(4 atom of C*12.001 g/mol)+(10*1.008 g/mol)+(1*15.9994 g/mol)=74.12 g/mol

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