Arjun purchased $250 \mathrm{g}$ of glucose $({\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6 )$ for $\mathrm{Rs} 40$. Find the cost of glucose per mole.

Convert the following degree Celsius temperature to degree Fahrenheit, $40°\mathrm{C}$.

Convert the following degree Celsius temperature to degree Fahrenheit, $30°\mathrm{C}$.

Calculate the number of moles and molecules of acetic acid present in $22 \mathrm{g}$ of it.

Calculate the number of atoms in $0.4$ mole of nitrogen. (Average atomic mass : $\mathrm{N}=14 \mathrm{u}$)

Calculate the number of atoms in the following, $1.6 \mathrm{g}$ of sulphur. (Average atomic mass : $\mathrm{S}=32 \mathrm{u}$)

$2.0 \mathrm{g}$ of a metal burnt in oxygen gave $3.2 \mathrm{g}$ of its oxide. $1.42 \mathrm{g}$ of the same metal heated in steam gave $2.27$ of its oxide. Which law is verified by these data ?