Q6 of 24 Page 166

Calculate the number of water molecules present in one drop of water which weighs 0.18 g.

According to mole concept we know that gram molecular weight of any compound consists of Avogadro number of molecules.


This implies that 18 grams of water consists 6.023 x 1023 molecules of water.


18 grams 6.023 x 1023 molecules


0.18 grams ?


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Find the gram molecular mass of the following from the data given:

i) H2O ii) CO2 iii) NaOH iv) NO2 v) H2SO4


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Complete the table given below:

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Fill in the blanks using the given data:

The formula of Calcium oxide is CaO. The atomic mass of Ca is 40, Oxygen is 16 and Carbon is 12.


i) 1 mole of Ca ( ____g) and 1 mole of Oxygen atom ( ___g) combine to form _____mole of CaO ( ____g).


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iii) 2 moles of Glucose