Answer:
0.29
Explanation:
The bottle contain 28 % by mass ammonia and ( 100 - 28)% remaining water
molar mass of ammonia = 17.031 g/mol
molar mass of water = 18.01528 g/mol
mole of ammonia present = 28 / 17 .031 = 1.64 mol
mole of water present = 72 / 18.01528 = 4 mol
mole fraction of ammonia = 1.64 / ( 4 + 1.64) = 0.29
The mole fraction of ammonia in such a solution is 0.29.
We were told that the solution contain 28 % by mass ammonia.
This means that the % by mass of water is (100-28) = 72%.
We can get the number of mole of the components with the formula
mole = mass/ molar mass
Molar mass of ammonia = 17.03 g/mol
Molar mass of water = 18.02 g/mol
Number of mole of ammonia present = 28 / 17 .031
= 1.64 mol
Number of mole of water present = 72 / 18.01528
= 4 mol
Mole fraction of ammonia = 1.64 / ( 4 + 1.64)
= 0.29
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