Chemistry Some Basic Concepts of Chemistry

Compound A contains 8.7% Hydrogen, 74% Carbon and 17.3% Nitrogen. The molecular formula of the compound is,

Given : Atomic masses of C,H and N are 12, 1 and 14 amu respectively. The molar mass of the compound A is 162 g mol^-1.

For complete combustion of methanol

$C{H}_{3}OH\left(1\right)+\frac{3}{2}{O}_2\left(g\right)\to C{O}_2\left(g\right)+2H_{2}O\left(I\right)$            

The amount of heat produced as measured by bomb calorimeter is 726 kJmol^-1 at 27°C. The enthalpy of combustion for the reaction is -x kJ mol^-1, where x is_________

(Nearest integer)

(Given : R = 8.3 J K^-1 mol^-1).

Hemoglobin contains 0.34% of iron by mass. The number of Fe atoms in 3.3g of hemoglobin is (Given: Atomic mass of Fe is 56 u, N_A = 6.022 * 10²³ mol^-1.)