Mass Percentage, Volume Percentage, Mass by Volume Percentage — Prelims Questions

A solution is prepared by dissolving $15\,\text{g}$ of urea (molar mass $60\,\text{g/mol}$) in $135\,\text{g}$ of water. What is the mass percentage ($w/w\%$) of urea in the solution?

An antiseptic solution contains $70\,\text{mL}$ of ethanol in a total solution volume of $100\,\text{mL}$. What is the volume percentage ($v/v\%$) of ethanol in the solution?

A $500\,\text{mL}$ bottle of intravenous glucose solution contains $25\,\text{g}$ of glucose. What is the mass by volume percentage ($w/v\%$) of glucose in this solution?

Which of the following concentration terms is independent of temperature?

A solution has a mass percentage of $20\%$ ($w/w$) of $NaOH$. If the density of the solution is $1.2\,\text{g/mL}$, what is the mass by volume percentage ($w/v\%$) of $NaOH$ in the solution?

When $20\,\text{mL}$ of liquid A is mixed with $80\,\text{mL}$ of liquid B, the final volume of the solution is found to be $98\,\text{mL}$. What is the volume percentage ($v/v\%$) of liquid A in the solution?