Step 1
% by mass:
Mass of solute ---- 100 of solution
Mass of solution = mass of solute + mass of solvent = 55.0 g + 137 g = 192 g
Solute = NH4Cl
Solvent = Water (H2O)
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Step 2
Procedure:
55.0 g NH4Cl --------- 192 g solution
X ---------- 100 g solution
X = 29 g NH4Cl = 29 % by mass approx.
Answer: 29 % by mass
This change in pressure is caused by changes in air density, and air density is related to temperature.
According to Dalton's Law, in a mixture of non-reacting gasses, thetotal pressure<span> exerted is the sum of the </span>partial pressures<span> of the component gasses. In more complicated circumstances, equilibrium states come into effect, but fortunately for us, </span>oxygen<span> is non-reactive with </span>water vapor<span>.</span>
