Question

1) The mass percentage of carbon is 27.28% and the mass percentage of oxygen is 72.73%. Calculate the molecular mass of that compound.

2) Copper Pyrite is the prime ore of copper. It is concentrated by froth floatation method.Give the reason.

PLEASE ANSWER IT FASTLY​

Answer 1

MOLECULAR WEIGHT IS = 88 gm /MOL

Froth flotation method is used because the impurities present in the ore gets separated by this process.

Explanation:

The weight of carbon is 27.8 grams

The weight of oxygen is 72.73 grams

Atomic weight of carbon is 12

Atomic weight of oxygen 15.99

number of moles of carbon: 12/27.8

      =0.431

number of moles of oxygen: 15.9/72.73

     =0.21

O2C

The molar mass of the compound is

0.43*2*72.73

=62.54 g/mol

0.21*27.8*1

= 5.838 g/mol

Now, molar mass/emperical mass

=  1.5

molecular formula= C204

MOLECULAR WEIGHT IS = 88 gm /MOL

2) The concept used is that that sulphite ore is wetted. Froth flotation method is used so that the impure particles gets attached to the specific mineral surfaces in a mineral water slurry.