According to Henry's law, P=KHS
S is the solubility in moles per litre
KH is the henry's law constant
P is the pressure in atm.
Substitute values in the above expression.
2.4=29.76×S
S=0.0806M
Thus 0.0806 moles are present in 1 L of solution. This corresponds to 0.086×44=3.52g