Expression of Concentration of Solutions — Prelims Questions

What is the molality of a solution containing 18 g of glucose ($C_6H_{12}O_6$) dissolved in 250 g of water? (Molar mass of glucose = 180 g/mol)

A solution is prepared by dissolving 4.9 g of $H_2SO_4$ in 200 mL of solution. What is the molarity of the solution? (Molar mass of $H_2SO_4 = 98\,\text{g/mol}$)

Which of the following concentration terms is independent of temperature?

A solution contains 20% by mass of $NaOH$. If the density of the solution is $1.2\,\text{g/mL}$, what is the molarity of the solution? (Molar mass of $NaOH = 40\,\text{g/mol}$)

A solution of ethanol in water is 46% by mass. What is the mole fraction of ethanol in the solution? (Molar mass of ethanol ($C_2H_5OH$) = $46\,\text{g/mol}$, Molar mass of water ($H_2O$) = $18\,\text{g/mol}$)

A 500 mL solution contains 0.002 g of $CaCO_3$. What is the concentration in ppm? (Molar mass of $CaCO_3 = 100\,\text{g/mol}$, assume density of solution is $1\,\text{g/mL}$)