Question

1. Calculate the number of moles for the following:

(i) 52 g of He (finding mole from mass)

(ii) 12.044 × 1023 number of He atoms (finding mole from number of particles).



2. Calculate the number of moles for the following:

(i) 52 g of He (finding mole from mass)

(ii) 12.044 × 1023 number of He atoms (finding mole from number of particles).



3.Calculate the mass of the following:

(i) 0.5 mole of N of molecule)

(ii) 0.5 mole of N atoms (mass from mole of atom)

(iii) 3.011 × 1023 number of N atoms (mass from number)

(iv) 6.022 × 10 23 number of N2 molecules (mass from number)

4.Calculate the number of particles in each of the following:

(i) 46 g of Na atoms (number from mass)

(ii) 8 g O 2 molecules (number of molecules from mass)

(iii) 0.1 mole of carbon atoms ​

Answer 1

Answer:

(ii) 0.5 mole of N atoms (mass from mole of atom)

(iii) 3.011 × 1023 number of N atoms (mass from number)

(iv) 6.022 × 10 23 number of N2 molecules (mass from number)

4.Calculate the number of particles in each of the following:

Answer 2

Answer:

• The molar mass that is the mass of 6.022 X 1023 atoms of helium is 4g. Hence 1 mole of He = 4 g of He = 6.022 X 1023atoms of He. 1 g of He = (6.022 X 1023) / 4 atoms of He. 52 g of He = (6.022 X 1023X 52 ) / 4 atoms of He.
• For Helium,
• Number of atoms=Number of moles ×6.022×1023

No of Moles = 6.022×10

2312.044×10

23 = 2.

Now, atomic mass of He=4

Weight = 2×4 = 8 g

• The molar mass that is the mass of 6.022 X 1023 atoms of helium is 4g. Hence 1 mole of He = 4 g of He = 6.022 X 1023atoms of He. 1 g of He = (6.022 X 1023) / 4 atoms of He. 52 g of He = (6.022 X 1023X 52 ) / 4 atoms of He.
• As we know, gram atoms = gram mole

here, no of moles = 23/46 =2 so no of gram atoms are 2.

Explanation:

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