Question

Question :-

(1) What is the ratio of molecules in 1 mole of NH$_3$ and 1 mole of HNO$_3$.

(2) The mass of an atom of hydrogen is 1.008 u. What is the mass of 18 atoms
of hydrogen. (18.144 u).

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Answer 1

$\sf\bold{\red{{\large{\underline{\bf{\underline{Given\: : - }}}}}}}$

$• \large \: \sf \: 1 \: mole \: of \: NH _3$

$• \large \: \sf 1 \: mole \: of \: HNO_3$

$\sf\bold{\red{{\large{\underline{\bf{\underline{To \: \: find \: : - }}}}}}}$

• What are the Ratio of number of molecules

$\sf\bold{\red{{\large{\underline{\bf{\underline{Solution \: : - }}}}}}}$

$\clubsuit\: \: \sf\bold{\blue{\: As\:we \: know :-}}$

A mole is defined as the amount of a substance that contains exactly 6.022 × 10²³

$∴ \large \: \sf \: 1 \: mole \: of \: NH _3 \: contians \: 6.022 \times {10}^{23} molecules$

$∴ \large \: \sf \: 1 \: mole \: of \: HNO _3 \: contians \: 6.022 \times {10}^{23} molecules$

• Ratio of number of molecules

$➯ \: {\sf {{\dfrac{{\cancel{{6.022 \times {10}^{23} }} \: \: ^ {1}}}{{\cancel{{6.022 \times {10}^{23} }} \: \: ^{1}}}}}}$

$➯ \large \: \frac{1}{1}$

As both the ratio is equal so the ratio of molecules in them is equal to 1 : 1 .

$\sf\bold{\green{{\large{\underline{\bf{\underline{Given\: : - }}}}}}}$

• Mass of an atom of hydrogen is 1.008 u.

$\sf\bold{\green{{\large{\underline{\bf{\underline{To \: find \: : - }}}}}}}$

• The mass of 18 atoms of hydrogen.

$\sf\bold{\green{{\large{\underline{\bf{\underline{Solution \: : - }}}}}}}$

$\clubsuit\: \: \sf\bold{\blue{As \: it \: is \: given \: as :-}}$

➯ The mass of an atom of hydrogen = 1.008 u

➯ The mass of 18 atoms of hydrogen

= 18 × 1.008 u

= 18.44 u

∴ The mass of 18 atoms of hydrogen = 18.44 u

Answer 2

Question :-

What is the ratio of molecules in 1 mole of NH_3 and 1 mole of HNO_3

Answer :-

The ratio of molecules in 1 mole of NH3 and 1 mole of HNO3 is 1:1.

Question :-

The mass of an atom of hydrogen is 1.008 u. What is the mass of 18 atoms

of hydrogen. (18.144 u).

Answer :-

18.144g will be the mass of 18 atoms. Explanation: Since we know from the question that the mass of a single hydrogen atom is given as 1.008 u hence for calculating the mass of those 18 atoms we can get the mass by multiplying 1.008 to 18 which will give us the required result.

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