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Molarity

What will be ...

Question

What will be the molarity of the solution in which $0.365 g$ of $H C l$ gas is dissolved in $100 m L$ of solution?

2 M

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0.2 M

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1 M

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0.1 M

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Solution

The correct option is C $0.1 M$
Molarity=$\dfrac{number of moles}{volume(L)}$
and number of moles= $\frac{m a s s}{m o l a r m a s s}$
For HCl, mass=0.365g, molar mass=36.5 g/mol and volume=100mL=0.1 L
Thus, molarity= $\frac{0.365}{36.5 \times 0.1} = 0.1 M$

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