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

3.4 Using concentrations of solutions in mol/dm3

The table gives information about solutions R and S.

Solution	Solute	Relative formula mass, $M_r$	Concentration in $g/dm3\text{g}/\text{dm}^3$
R	magnesium sulfate	120	18.0
S	sodium nitrate	85	17.0

Equal volumes of R and S are compared. Which statement is correct?

[1]

R contains more moles of solute, because R has the higher concentration in $mol/dm3\text{mol}/\text{dm}^3$ .

R and S contain the same number of moles, because their concentrations in $mol/dm3\text{mol}/\text{dm}^3$ are equal.

R contains more moles of solute, because R has the higher concentration in $g/dm3\text{g}/\text{dm}^3$ .

S contains more moles of solute, because S has the higher concentration in $mol/dm3\text{mol}/\text{dm}^3$ .

The table gives information about solutions R and S.

Solution	Solute	Relative formula mass, $M_r$	Concentration in $g/dm3\text{g}/\text{dm}^3$
R	magnesium sulfate	120	18.0
S	sodium nitrate	85	17.0

Equal volumes of R and S are compared. Which statement is correct?

R contains more moles of solute, because R has the higher concentration in $mol/dm3\text{mol}/\text{dm}^3$ .

R and S contain the same number of moles, because their concentrations in $mol/dm3\text{mol}/\text{dm}^3$ are equal.

R contains more moles of solute, because R has the higher concentration in $g/dm3\text{g}/\text{dm}^3$ .

S contains more moles of solute, because S has the higher concentration in $mol/dm3\text{mol}/\text{dm}^3$ .

3.4 Using concentrations of solutions in mol/dm3 Questions