Level 1

Which of the following weighs the least? 

How many liters of ammonia will be formed when $2 \mathrm{L}$ of ${\mathrm{N}}_2$ and $2 \mathrm{L}$ of ${\mathrm{H}}_2$ are allowed to react? All volumes are measured at same temperature and pressure.

What volume of $0.10 \mathrm{M} {\mathrm{H}}_2{\mathrm{SO}}_4$ must be added to $50 \mathrm{mL}$ of a $0.10 \mathrm{M} \mathrm{NaOH}$ solution to make a solution in which the molarity of the ${\mathrm{H}}_2{\mathrm{SO}}_4,$ is $0.050 \mathrm{M}$?

$112.0 \mathrm{mL}$ of ${\mathrm{NO}}_2$ at $\mathrm{STP}$ was liquefied, the density of the liquid being $1.15 \mathrm{g} {\mathrm{mL}}^{-1}$. Calculate the volume and the number of molecules in the liquid ${\mathrm{NO}}_2$.

Which of the following concentration factor is affected by change in temperature?

A solution containing $3.00 \mathrm{g}$  of a monobasic organic acid was just neutralised by $40 \mathrm{mL}$ of $0.5 \mathrm{N} \mathrm{NaOH}$ solution. Calculate the molecular weight of the acid.

The chloroplatinate of a diacid base contains $39\%$ platinum. What is the molecular weight of the base? $(\mathrm{Pt}=195)$

$0.304 \mathrm{g}$ of a silver salt of a dibasic acid left $0.216 \mathrm{g}$ of silver on ignition. Calculate its molecular weight.