Some Basic Concepts of Chemistry - Result Question 31
Subjective Quesions
31. Calculate the amount of calcium oxide required when it reacts with $852 g$ of $P _4 O _{10}$.
(2005, 2M)
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Answer:
Correct Answer: 31. (1008 g)
Solution:
- The balanced reaction is
$\begin{aligned} & \qquad 6 \mathrm{CaO}+\mathrm{P}4 \mathrm{O}{10} \longrightarrow 2 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \\ & \text { Moles of } \mathrm{P}4 \mathrm{O}{10}=\frac{852}{284}=3 \\ & \text { Moles of } \mathrm{CaO} \text { required }=3 \times 6=18 \\ & \text { Mass of } \mathrm{CaO} \text { required }=18 \times 56=1008 \mathrm{~g} \end{aligned}$
BETA
