For the reaction $N_2 + 3H_2 \to 2NH_3$,which of the following represents the correct expression for $d[NH_3]/dt$?

Write the following equations for the reaction $R \to P$: $(i)$ Average rate $(ii)$ Instantaneous rate.

Which of the following statements is correct?

Consider the following reactant samples:
$I$. $1 \ mol$ of $A$ and $2 \ mol$ of $B$ in a $1 \ L$ vessel
$II$. $2 \ mol$ of $A$ and $2 \ mol$ of $B$ in a $2 \ L$ vessel
$III$. $0.2 \ mol$ of $A$ and $0.2 \ mol$ of $B$ in a $0.1 \ L$ vessel
Which reactant sample reacts at the highest rate if the reactants are in the gaseous state and do not follow a zero-order reaction?

Nitric oxide reacts with $H_2$ according to the reaction:
$2 NO_{(g)} + 2 H_{2(g)} \rightarrow N_{2(g)} + 2 H_{2}O_{(g)}$
Identify the correct relationship for the rate of consumption of reactants and the rate of formation of products.

For the decomposition reaction $N_2O_{4(g)} \rightarrow 2NO_{2(g)}$,the initial pressure of $N_2O_4$ decreases from $0.46 \ atm$ to $0.28 \ atm$ in $30 \ minutes$. What is the rate of formation of $NO_2$?