Stoichiometry

Trending Questions

Q. How many moles of

C O_{2}

will be produced when

10 m o l

N a H C O_{3}

is decomposed?

2 N a H C O_{3}

\to

N a_{2} C O_{3}

H_{2} O

C O_{2}

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Q. How many moles of

S O_{2}

can be made by using

0.5 m o l

S_{8}

in the following reaction?

S_{8}

8 O_{2}

\to

8 S O_{2}

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Q. If

1 \frac{1}{2}

moles of oxygen combine with Al to form

A l_{2} O_{3}

, the weight of Al used in the reaction is: (atomic wt of Al = 27 u)

27 g
54 g
40.5 g
81 g

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Q. Find the incorrect relation between the stoichiometric coefficients of the following balanced reaction.

x K_{2} C r_{2} O_{7} + y H I \to z K I + α C r I_{3} + β H_{2} O + γ I_{2}

$y = z + α + β + γ$
$β = z + α + γ$
$γ = z + α - x$
$y = β - x$

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C l_{2} + 2 K O H \to K C l + K C l O + H_{2} O

3 K C l O \to 2 K C l + K C l O_{3}

4 K C l O_{3} \to K C l + 3 K C l O_{4}

2 moles of chlorine gas reacted with an excess of potassium hydroxide and 50 g of potassium perchlorate was obtained. Calculate the percentage yield of perchlorate in the reaction.
Molar mass of potassium perchlorate = 138.5 g/mol

72 %
60 %
90 %
49 %

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Q. A

0.60 g

sample consisting of only

C a C_{2} O_{4}

and

M g C_{2} O_{4}

is heated at

500^{o} C,

converting the two salts of

C a C O_{3}

and

M g C O_{3} .

The sample then weighs

0.465 g

. If the sample had been heated to

900^{o} C

and the products are

C a O

and

M g O

, what would the mixtures of oxides have weighed?

$0.12 g$
$0.21 g$
$0.252 g$
$0.3 g$

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Q. 60 mL of mixture of equal volumes of

C l_{2}

and an oxide of chlorine, i.e.,

C l_{2} O_{n}

was heated and then cooled back to the original temperature, The resulting gas mixture was found to have volume of 75 mL. On treatment with KOH solution, the volume contracted to 15 mL. Assume that all measurements are made at the same temperature and pressure. Deduce the value of n in