Question

*The number of molecules in a given quantity of a substance depends on the _____ of that substance.*

1️⃣ atomic mass
2️⃣ molecular mass in grams
3️⃣ molecular mass
4️⃣ Avogadro number​

Answer 1

2. Molecular mass in grams is the correct answer.

• Avogadro's number is defined as "the number of molecules in one mole of any molecular substance."
• The value of Avogadro's number is 6.02*10²³ mol-¹.
• Number of molecules is calculated by the formula : number of moles*Avogadro's number.
• Number of moles is further calculated by the formula- weight/molecular weight, where molecular weight is in gram/mol.

Answer 2

Given :- The number of molecules in a given quantity of a substance depends on the _____ of that substance.

1) atomic mass

2) molecular mass in grams

3) molecular mass

4) Avogadro number

Answer :- 2) molecular mass in grams .

Explanation :-

• Molecular mass is the mass of a given substance divided by the amount of that substance, measured in g/mol.
• The mole (mol) is the unit of measurement for amount of substance .
• The mass of one mole of a substance is equal to that substance’s molecular weight.
• Avogadro’s number is defined as the number of molecules, atoms, compounds, etc. per mole of a substance.
• It is equal to 6.022×10^23 mol^(-1) and is expressed as the symbol NA.

therefore, we can conclude that, The number of molecules in a given quantity of a substance depends on the molecular mass in grams of that substance.

Learn more :-

*The valency of sodium is 1, the valency of SO₄ is 2, then the chemical formula of the compound is ______.*

1️⃣ Na₂SO₄

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