Question

For a zero-order reaction $A$ $\to$ product, the rate constant is ${10}^{-2}mol{L}^{-1}{s}^{-1}$ . Starting with 10 moles of $A$ in a 1 L vessel, how many moles of $A$ would be left unreacted after 10 minutes?

• A. 5 moles
• B. 6 moles
• C. 4 moles
• D. 10 moles

Answer 1

Answer: (C)

4 moles

$k={10}^{-2}$
$kt=R_o-R$
${10}^{-2}\times 10\times 60=\frac{10}{1}-R$
$R$ $=6mol{L}^{-1}$
6 mole react unreacted mole $=10-6$
$=4moles$