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Atomic Number and Mass Number

How much is t...

Question

How much is the gram atomic mass of oxygen?

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Solution

Definition of gram atomic mass:
The mass of one mole of atoms of an element is known as the gram atomic mass.
The gram atomic mass of oxygen:
One mole of oxygen = Atomic mass of oxygen = $(16 u)$ in grams
$1$ mole of oxygen = $16 g$
Hence, the gram atomic mass of oxygen is $16 g$ .

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Q. (a) Define gram atomic mass of a substance. How much is the gram atomic mass of oxygen ?
(b) How many moles of oxygen atoms are present in one mole of the following compounds ?

(i) Al₂O₃
(ii) CO₂
(iii) Cl₂O₇
(iv) H₂SO₄
(v) Al₂(SO₄)₃

Q. Calculate the gram molecular mass of water from the values of gram atomic mass of Hydrogen and of Oxygen.
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= 1 g

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if one mole of oxygen atom weights 16 grams,what is the mass (in grams) of one atom of oxygen?

Q. Calculate.
(A) Mass of 1.5-gram atoms of calcium. (Atomic mass = 40)
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If one mole of oxygen atoms weighs 16 grams, calculate the mass of one atom of oxygen (in grams).

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