Chemistry

Energy of 1 photon = $\frac{hc}{\lambda }$  

Energy of 1 mole of photon =  $N_A*\frac{hc}{\lambda }$  

$=\frac{6.022*10^{23}*6.63*10^{-34}*3*10^8}{300*10^{-9}}$  

=0.399 * 10⁶ J = 399KJ

Number of moles of C = Number of moles of CO₂ = $\frac{330}{44}$ moles

Number of moles of H = 2 * no. of moles of H₂O = $\left(\frac{270}{18}*2\right)$ moles

 Mass of C = $\frac{330}{44}*12$ gm = 90 gm

 Mass of H = $\frac{270}{18}*2*1gm=30gm$

$\begin{array}{l}\mathrm{\%}ofC=\frac{90}{120}*100\mathrm{\%}=75\mathrm{\%}\\ \mathrm{\%}ofH=\frac{30}{120}*100\mathrm{\%}=25\mathrm{\%}\end{array}$  

In disproportionation reaction, one element of a compound will simultaneously get reduced and oxidised. In ClO₄ -, oxidation number of Cl is +7 and it can not increase it further. So, ClO₄- will not get oxidised and so will not undergo disporportionation reaction.

Correct order is Be

InA-O-H, if EN of ' A' is 2.1 then it will be neutral, as X_A-X₀=X₀-X_H. (where X is EN)

Bond order in N $N_2$ and O $O_2^{2+}$ is 3 (calculated by energy level diagram)

The order of stability of resonating structures: carrying no charge $>$  carrying minimum charge and each atom having octet complete.

Kindly consider the following figure