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  • Solve! Which of the following has maximum number of moleclues?

Which of the following has maximum number of moleclues?

  • Option 1)

    100g CaCO3

  • Option 2)

    1.1 mol of H2O

  • Option 3)

    11.2L of NH3 at STP

  • Option 4)

    14g of N2

 

Answers (1)

As we learnt.

 

Dimensional Analysis -

While calculating, the units should be the same all across the equation

- wherein

The units for each physical quantity should be the same throughout th equation. eg. If temperature is involved, the units should be kelvin on both sides

 

 

 

Lets express all the entities in same physical quantities and same units

100g\;CaCO_{3}\rightarrow \frac{100}{molar mass \;of \;CaCO_{3}} moles = 1mol

1.1mol\;H_{2}O\rightarrow 1.1mol\;H_{2}O

11.2L \; of \; NH_{3}\;at\;STP\rightarrow \frac{11.2}{22.4} = 0.5mol

14g \; of \; N_{2} \rightarrow \frac{14}{28} = 0.5mol

 


Option 1)

100g CaCO3

This is incorrect

Option 2)

1.1 mol of H2O

This is correct

Option 3)

11.2L of NH3 at STP

This is incorrect

Option 4)

14g of N2

This is incorrect

Posted by

Vakul

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