Question

Chemistry NTSE Question The mass of sodium in 11.7 g of sodium chloride is (a) 2.3 g (b) 4.6 g (c) 6.9 g (d) 7.1 g

Answer 1

mass of 1 mol soduim chloride = 58.5
moles in11.7 g = 11.7/58.5 = 0.2 mol

weight of 0.2mol sodium = 0.2*23 = 4.6g
Answer is B.

Answer 2

The mass of sodium in 11.7 g of sodium chloride 4.6 g.

Option (b)

Solution:

Sodium chloride (NaCl) has a molar mass 23.  

Cl has a molar mass of 35.5.

Na has a molar mass of 35.5.

So we can calculate molar mass of NaCl

23 + 58.5 = 58.5 g

A 58.5 g NaCl contains 23 grams of Na. Therefore x grams of Na is present in 11.7 g.

X in 11.7 g.

$\begin{array}{l}{\frac{x}{23}=\frac{11.7}{58.5}} \\\\ {X=23 \times\left(\frac{11.7}{58.5}\right)}\end{array}$

= 4.60 g.

So, 4.60 g Na present in 11.7 g sodium chloride (NaCl).

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