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Mole Concept and Avogadro's Number

Four grams of...

Question

Four grams of caustic soda contains :

(a) $6.02 \times 10^{23} a t o m s o f i t,$
(b) 4 g atom of sodium,
(c) $6.02 \times 10^{22}$ molecules

(d) 4 moles of NaOH.

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Solution

Grams into moles:

$4 g N a O H \times \frac{1 m o l N a O H}{39.99 g (m o l a r m a s s) N a O H} = 0.1 m o l N a O H$

Then find the number of molecules using Avogadro's number:

$0.1 m o l N a O H \times \frac{6.02 \times 10^{23} m o l e c u l e s o f N a O H}{1 m o l N a O H}$

$= 6.02 \times 10^{22} m o l e c u l e s N a O H$

(c) $6.02 \times 10^{22} m o l e c u l e s$

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