Five grams of $K C l O_{3}$ yield 3.041 g of $K C l$ and 1.36 L of oxygen at standard temperature and pressure. Do these figures support the law of conservation of mass within limits of $\pm 0.4 %$ error?

True

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False

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Solution

The correct option is A
True

According to gram - molecular volume law, 22.4 L of all gases and vapours at STP weigh equal to their molecular weights denoted in grams.

$∴$ Weight of 1.36 L of oxygen at STP =32 $\times$ $\frac{1.36}{22.4} = 1.943 g$

Weight of KCl formed = 3.041 g (given)

$∴$ Total weight of product (KCl + $O_{2}$ )

= 3.041 + 1.943 = 4.984 g

Error = 5 - 4.984 = 0.01 6 g

$∴ % e r r o r = 0.016$ $\times$ $\frac{100}{5}$ =0.32

Hence, the law of conservation of mass is valid within limits of $- 0.4 %$ error. Thus, the law is supported.

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Similar questions

Five grams of $K C l O_{3}$ yields 3.0 g of $K C l$ and 1.4 L of oxygen at standard temperature and pressure. Do these figures support the law of conservation of mass within limits of $\pm 0.4 %$ error?

Q. What mass of potassium chlorate

(K C l O_{3})

on heating gives 1.491 g of potassium chloride (KCl) and 0.672 litres of oxygen at NTP?

Q. The mass of

6.02 \times 10^{23}

molecules of a gas is 64.0 grams. What volume does 8.00 grams of the gas occupy at standard temperature and pressure?

Q. Oxygen is prepared by catalytic; decomposition of potassium chlorate

(K C l O_{3})

. Decomposition, of potassium chlorate gives potassium chloride

(K C l)

and oxygen

(O_{2})

. How many moles and how many grams of

K C l O_{3}

are required to produce 2.4 mole

O_{2}

The mass of a litre of oxygen at standard conditions of temperature and pressure is 1.43 g and that of a litre of

{S O}_{2}

is 2.857 g.

(i) How many molecules of each gas are there in this volume?

(ii) What is the mass in grams of a single molecule of each gas?

(iii) What are the molecular masses of

{S O}_{2}

and

O_{2}

respectively?

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Five grams of KClO3 yield 3.041 g of KCl and 1.36 L of oxygen at standard temperature and pressure. Do these figures support the law of conservation of mass within limits of ±0.4% error?

Five grams of $K C l O_{3}$ yield 3.041 g of $K C l$ and 1.36 L of oxygen at standard temperature and pressure. Do these figures support the law of conservation of mass within limits of $\pm 0.4 %$ error?