Question

calculate the mass of =(i) 0.5 mole CO2 gas (ii) 3.05×10^5 number of Na atom​

Answer 1

Answer:

(i) mass of 0.5 mole of CO2 gas :-

Molecular mass of co2= (12*1)+(16*2)= 12+24 = 44g

and let the given mass be x

Now we know that

No of Moles = Given mass/Molecular mass

0.5 = x/44

thus, x = 0.5 × 44

=22 g.

(ii) Atomic mass of Na= 23 u = 23g

Also let the given mass be x

now we know that number of atoms = (given mass×Avagardos number)/ Atomic mass

=》 3.05 × 10⁵ = (x* 6.022 * 10²³) /23

x = 11.64 × 10‐¹⁸ g

Explanation:

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