Question

Calculate the atomic mass of these compounds:-

1- H2O
2- CaCO3
3- NaCO3
4- AlO3

Please give answer with proper equation and steps.....

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Answer 1

Answer:

One mole of H2 O is made up of 2 moles of Hydrogen atoms and 1 mole of Oxygen atom. Mass of two moles of Hydrogen atoms = 2x 1 g/mol = 2 g/mol. Mass of one mole of water = 2 g/mol + 16 g/mol = 18 g/mol.

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Molecular weight is the mass of whole molecule.

Steps:- (1) Chemical formula of calcium carbonate ⟶CaCO

3

(2) Mass of Calcium⟶40

Mass of Carbon⟶12

Mass of Oxygen⟶16

(3) Multiply mass of each element by number of atoms of that element.

(4) Add all the masses obtained after multiplication.

⟶CaCO

3

=1×40+1×12+3×16

=40+12+48

=100.

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The molar mass of sodium carbonate is

105.987 g/mol

Explanation:

To calculate the molar mass of a compound, multiply the subscript of each element from the formula times the molar mass of the element. The molar mass of an element is its atomic weight (relative atomic mass) on the periodic table in g/mol.

Molar mass of Na2CO3

$</p><p>(2×22.98976928g/mol Na)$

$Molar mass of Na2CO3</p><p></p><p> \\ (2×22.98976928g/mol Na) \\ +(1×12.0107g/mol C) \\ +(3×15.999g/mol O)=105.987 g/ \\ mol Na2CO3</p><p></p><p>$

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Explanation:

RELATED QUESTION ANSWER

1. Calculate the molecular masses of H2, O2, C12, CO2, CH4, C2H6, C2H4, NH3, CH3OH.

Ans. The molecular masses are:

H2 ⇒ 1 × 2 → 2u

O2⇒ 16 × 2 → 32u

Cl2 ⇒ 35.5 × 2 → 71 u

CO2 ⇒ 1 × 12 + 2 × 16 = 12 +32 = 44 u

CH4 ⇒ 1 × 12 + 4 × 1 = 16 u

C2H6 ⇒�n2 × 12 + 6 × 1 = 30 u

C2H4 ⇒ (2 × 12) + (4 × 1) = 28 u

NH3 ⇒ (1 × 14) + (3 × 1) = 17 u

CH3OH ⇒ 12 + (3 × 1) + 16 + 1 = 32 u

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Define the atomic mass unit.

Ans. One atomic mass unit is equal to exactly one-twelfth (1/12th) the mass of one atom of carbon-12. The relative atomic masses of all elements have been found with respect to an atom of carbon-12.

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Why is it not possible to see an atom with naked eyes?

Ans. Atom is too small to be seen with naked eyes. It is measured in nanometres.

1 m = 109 nm

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Answer 2

What Is H₂O :- H₂O is a chemical reaction name that we use daily in our lives on Earth; it is a commonly used chemical formula for “WATER”. It includes the chemical reaction of one or more atomicity of different elements where we see two atoms of hydrogen (H) and one atom of oxygen (O) which creates one molecule of water. It is based on the law of chemical combination.

As CaCO3 contains only 1 mole of carbon, thus the mass of carbon present in 100g calcium carbonate, i.e., 1 mole CaCO3 is 12g.