Parts per Million, Mole Fraction — MCQ Practice

A $250,\text{mL}$ sample of water contains $1.5,\text{mg}$ of fluoride ions. Assuming the density of water is $1,\text{g/mL}$, what is the concentration of fluoride ions in PPM?

A solution contains $180,\text{g}$ of glucose ($ext{C}_6\text{H}_{12}\text{O}_6$, Molar mass = $180,\text{g/mol}$) and $72,\text{g}$ of water ($ext{H}_2\text{O}$, Molar mass = $18,\text{g/mol}$). What is the mole fraction of glucose in the solution?

Which of the following statements about mole fraction is INCORRECT?

A solution has a concentration of $0.005$ by mass. What is its concentration in Parts per Million (PPM)?

A gas mixture contains $2,\text{mol}$ of nitrogen ($ext{N}_2$) and $8,\text{mol}$ of oxygen ($ext{O}_2$). If the total pressure of the mixture is $5,\text{atm}$, what is the partial pressure of nitrogen?

A solution is prepared by dissolving $1.71,\text{g}$ of sucrose ($ext{C}_{12}\text{H}_{22}\text{O}_{11}$, Molar mass = $342,\text{g/mol}$) in $100,\text{g}$ of water ($ext{H}_2\text{O}$, Molar mass = $18,\text{g/mol}$). What is the mole fraction of sucrose in the solution?