Question bank3.4 Using concentrations of solutions in mol/dm3

3.4 Using concentrations of solutions in mol/dm3

A laboratory has solutions P and Q.

Solution	Solute	Relative formula mass, $M_r$	Concentration in $mol/dm3\text{mol}/\text{dm}^3$
P	calcium chloride	111	0.300
Q	ammonium nitrate	80	0.300

Equal volumes of P and Q are compared. Which statement is correct?

[1]

Q contains more solute by mass because ammonium nitrate has the smaller relative formula mass.

P contains more solute by mass because calcium chloride has the greater relative formula mass.

The masses of solute cannot be compared unless the exact volume of each solution is known.

Both contain the same mass of solute because their concentrations in $mol/dm3\text{mol}/\text{dm}^3$ are equal.

A laboratory has solutions P and Q.

Solution	Solute	Relative formula mass, $M_r$	Concentration in $mol/dm3\text{mol}/\text{dm}^3$
P	calcium chloride	111	0.300
Q	ammonium nitrate	80	0.300

Equal volumes of P and Q are compared. Which statement is correct?

Q contains more solute by mass because ammonium nitrate has the smaller relative formula mass.

P contains more solute by mass because calcium chloride has the greater relative formula mass.

The masses of solute cannot be compared unless the exact volume of each solution is known.

Both contain the same mass of solute because their concentrations in $mol/dm3\text{mol}/\text{dm}^3$ are equal.

3.4 Using concentrations of solutions in mol/dm3 Questions