Question

59. Atomic mass of an element is 18 g. Then, the
number of gram-atoms in 18 kg of this element is
(1) 18 .
(3) 1000
(4) 1800
(2) 1​

Answer 1

Answer:

Option(2) 1000 is the correct answer. 1000 is the  number of gram-atom of the given element.

Explanation:

The mass of an element in grammes that is numerically equal to its atomic mass is known as the "grammes atomic mass."

"One gram atomic mass is the mass of an element in grams numerically equal to the atomic mass of the element."

The Gram-atoms can be calculated using the formula:

gram-atoms = $\frac{Given weight in(g)}{atomic mass}$

The given weight is in kilograms, we need to convert the weight in grams

therefore, the given weight = 18Kg = 18 × 1000 = 18000g

gram-atoms = $\frac{18000}{18} = 1000$ g atoms

The number of moles corresponds to the quantity of grammes atoms in a given sample. We only need to multiply the number of moles by the Avogadro value to determine the number of atoms.

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Answer 2

Answer:

From the given option, the correct option is 3) 1000.

Explanation:

• The "grams atomic mass" of an element is the mass expressed in grammes that is numerically equivalent to its atomic mass.
• The mass of an element in grammes that is numerically equal to its atomic mass is known as its "one gram atomic mass."
• The formula: can be used to determine the number of Gram-atoms.
• Grams-atoms equals to Given weight ÷ Atomic mass
• Since the weight is stated in kilograms, we must convert it to grams.
• The given weight = 18 kg = 18 x 1000 = 18000g
• Gram-atoms equal to 18000 ÷ 1000 = 1000 g atoms
• The quantity of atoms in a given sample, measured in grams, is equivalent to the number of moles. To get the number of atoms, we simply multiply the number of moles by the Avogadro value.

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