Some Basic Concepts of Chemistry - Result Question 8

####5. The number of water molecules is maximum in :

[2015 RS]

(a) 18 molecules of water

(b) 1.8 gram of water

(c) 18 gram of water

(d) 18 moles of water

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Solution:

  1. (d) No. of moles of water

In 1.8g of H2O=0.1 moles

In 18g of H22O=1 moles

1 mole contains 6.022×1023 molecules of water therefore maximum number of molecules is in 18 moles of water.

(a) Initially Mg1g+12O2MgO

or

$ \begin{matrix} \frac{1}{24} \text{ mole } & \frac{0.56}{32} \text{ mole } \



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