If equal moles of water and urea are taken in a flask,what is the percentage by weight of urea?

What will be the volume of a $12 \; M$ solution,if it is equivalent to $240 \; mL$ of an $18 \; M$ solution? (Express the answer in $litre$)

With an increase in temperature,which of the following concentration terms changes?

An aqueous solution of glucose is $10\%$ in strength. The volume in which $1 \, \text{g-mole}$ of it is dissolved will be ........... $L$.

In a solution of $7.8 \ g$ benzene $(C_6H_6)$ and $46.0 \ g$ toluene $(C_6H_5CH_3)$,the mole fraction of benzene in this solution is:

To $5.85 \, g$ of $NaCl$,$1 \, kg$ of water is added to prepare a solution. What is the strength of $NaCl$ in this solution? (Molecular weight of $NaCl = 58.5 \, g/mol$)