Element A on reaction with oxygen gives a compound $A_{2} O_{3}$ . If $0.359$ grams of A react to give $0.559$ grams of the compound, find the atomic weight (g) of A.

51

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43.08

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49.7

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47.9

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Solution

The correct option is B $43.08$
Weight of element A $= W_{A} = 0.359$ g
Weight of $O_{2}$ $= W_{O_{2}} = 0.559 - 0.359 = 0.2$ g
Let $x$ be the aomic weight of A.
$n_{A} : n_{O}$ $⟹ \frac{0.359}{x} : \frac{0.2}{16} = 2 : 3$
$⟹ x = 43.08$ g

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Element A on reaction with oxygen gives a compound A2O3. If 0.359 grams of A react to give 0.559 grams of the compound, find the atomic weight (g) of A.

The correct option is B 43.08Weight of element A =WA=0.359 gWeight of O2 =WO2=0.559−0.359=0.2 gLet x be the aomic weight of A.nA:nO ⟹0.359x:0.216=2:3⟹x=43.08 g

Element A on reaction with oxygen gives a compound $A_{2} O_{3}$ . If $0.359$ grams of A react to give $0.559$ grams of the compound, find the atomic weight (g) of A.

The correct option is B $43.08$
Weight of element A $= W_{A} = 0.359$ g
Weight of $O_{2}$ $= W_{O_{2}} = 0.559 - 0.359 = 0.2$ g
Let $x$ be the aomic weight of A.
$n_{A} : n_{O}$ $⟹ \frac{0.359}{x} : \frac{0.2}{16} = 2 : 3$
$⟹ x = 43.08$ g