Q3 of 27 Page 47

In 90 gram of water

What will be the total number of atoms?

Number of molecules = 3.011 × 1024 (calculated)

In H2O, there are three atoms


Thus, total number of atoms of H2O = 3 × Number of molecules


= 3 × 3.011 × 1024


= 9.033 × 1024


More from this chapter

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2

Examine the samples given:

a. 20 g of He


b. 44.8 L of NH3 at STP


c. 67.2 L of N2 at STP


d. 1 mol of H2SO4


e. 180 g of water


What will be the masses of samples b, c and d?

 3

In 90 gram of water

How many molecules are present?

 3

In 90 gram of water

What will be the total number of electrons in this total number of particles?

 4

You are given 100 g of NaOH, 200 mL water, beakers and weighing balance. How will you prepare a 1 molar (1 M) solution of NaOH taking sufficient quantities from these?