Question

calculate the molar mass of the following compounds . 1. MGo 2. Na2co3 3. h3po4 4. ca( oh)2 5. al2(so4)3​

Answer 1

Explanation:

1.) Molecular Mass of Magnesium Oxide

= atomic mass of magnesium (24 a.m.u) + atomic mass of oxygen ( 16 a.m.u)

= 40 a.m.u

2.) Molecular Mass of Sodium Carbonate

= 2 × atomic mass of Sodium (23 a.m.u) + atomic mass of carbon (12 a.m.u) + 3 × atomic mass of oxygen (16 a.m.u)

= 106 a.m.u

3.) Molecular Mass of Phosphoric acid

= 3 × atomic mass of hydrogen ( 1 a.m.u) + atomic mass of phosphorus ( 31 a.m.u) + 4 × atomic mass of oxygen ( 16 a.m.u)

= 98 a.m.u

4.) Molecular Mass of Calcium Hydroxide

= atomic mass of Calcium ( 40 a.m.u) + 2 × [ atomic mass of oxygen ( 16 a.m.u) + atomic mass of hydrogen ( 1 a.m.u) ]

= 74 a.m.u

5.) Molecular Mass of Aluminum Sulfate

= 2× atomic mass of Aluminum ( 27 a.m.u) + 3 × [atomic mass of sulphur( 32 a.m.u) + 4 × atomic mass of oxygen ( 16 a.m.u) ]

= 342 a.m.u