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Mole Concept

The standard ...

Question

The standard heat of combustion of $A l (s)$ is $- 838 k J m o l^{- 1}$ at $298 K$ . If $A l$ reacts with $O_{2}$ at $298 K$ , which of the following released $250 k J$ of heat?

The reaction of

0.2998

moles of

A l

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The formation of

0.149

moles of

A l_{2} O_{3}

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The formation of

0.298 m o l e s

A l_{2} O_{3}

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The reaction of

8.046

grams of aluminium

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Solution

The correct option is A The reaction of $0.2998$ moles of $A l$
Moles= $\frac{250}{838} = 0.2998$
Hence, $250 K J$ of heat will be released when $0.2998$ moles of $A l$ reacts with $O_{2}$ at $298 K$ .

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Similar questions

The standard heat of combustion of $A l$ is $- 837.8 k J m o l^{- 1}$ $25^{\circ} C$ which of the following releases $250 k c a l$ of heat?

A l

and

K C l O_{3}

react together to form

A l_{2} O_{3}

according to the following reactions :

2 K C l O_{3} ⟶ 2 K C l + 3 O_{2}

4 A l + 3 O_{2} ⟶ 2 A I_{2} O_{3}

4

moles of

K C l O_{3}

(

50 %

pure) on reaction with excess of Al forms _______ moles of

A l_{2} O_{3}

Q. If 1.5 moles of oxygen combines with

A l

to form

A l_{2} O_{3},

the mass of

A l

in gram (atomic mass of

A l = 27

) used in the reaction is :

Q. The standard heat of combustion of

A l i s - 837.8 k J m o l^{- 1} a t 25^{\circ} C

. If

A l

reacts with

O_{2} a t 25^{\circ} C

, the formation of

0.150 m o l o f A l_{2} O_{3}

release

x k J

of heat.

x is ....................

Q. If

1 \frac{1}{2}

moles of oxygen combine with

A l

to form

A l_{2} O_{3}

, the weight of

A l

used in the reaction is:

(A l = 27)

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The standard heat of combustion of Al(s) is −838 kJ mol−1 at 298 K. If Al reacts with O2 at 298 K, which of the following released 250 kJ of heat?

The correct option is A The reaction of 0.2998 moles of AlMoles= 250838=0.2998Hence, 250KJ of heat will be released when 0.2998 moles of Al reacts with O2 at 298K .

The standard heat of combustion of $A l (s)$ is $- 838 k J m o l^{- 1}$ at $298 K$ . If $A l$ reacts with $O_{2}$ at $298 K$ , which of the following released $250 k J$ of heat?

The correct option is A The reaction of $0.2998$ moles of $A l$
Moles= $\frac{250}{838} = 0.2998$
Hence, $250 K J$ of heat will be released when $0.2998$ moles of $A l$ reacts with $O_{2}$ at $298 K$ .