Hydrogen and oxygen combine in ratio of 1:8 by mass to form water. What mass of oxygen gas would be

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3. ATOMS AND MOLECULES

easy

Hydrogen and oxygen combine in the ratio of $1:8$ by mass to form water. What mass of oxygen gas would be required to react completely with $3 \,g$ of hydrogen gas ?

A

$18\, g$

B

$24\, g$

C

$9\, g$

D

$36\, g$

Solution

'Law of constant proportions' states that composition of a compound is always fixed. Applying this

$1 \,g$ of hydrogen gas combines with oxygen $= 8 \,g $

$3 \,g$ of hydrogen gas will combine with oxygen $= 8 \times 3 = 24\, g$

Standard 9

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