Concentration Units & Raoult's Law

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1.
A 0.5 M H2SO4 solution has a density of 1.06 g/mL. Its molality is approximately:
2.
For an ideal binary solution of A (P_A_std = 200 mmHg) and B (P_B_std = 100 mmHg) with x_A = 0.3, the total vapour pressure is:
3.
In an ideal binary solution, the more volatile component is:
4.
Two liquids A and B form an ideal solution. If x_A = 0.4, P_A_std = 100 mmHg, P_B_std = 200 mmHg, the mole fraction of A in the vapour phase is:
5.
Which concentration unit is temperature-independent?

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