The mass of a sample of NH3 containing 6.3× 10²⁴ molecules of NH₃ is 178 gm , i.e. Option B
What is a mole ?
A mole is defined as 6.022 × 10²³ atoms, molecules, ions, or other chemical units.
and the molar mass of a substance is defined as the mass of 1 mole of that substance, expressed in grams per mole.
It is equal to the mass of 6.022 × 10²³ atoms, molecules, or formula units of that substance.
6.022× 10²³ molecules are present in 1 mole
6.3× 10²⁴ molecules will be present in
[tex]\rm =\dfrac{6.3\times 10^{24}}{6.022\times 10^{23} } \;moles[/tex]
= 10.46 moles
Molar mass(1 mole) of NH₃ is 17 gm
10.46 moles will have mass of 10.46* 17 = 178 gm
The mass of a sample of NH₃ containing 6.3× 10²⁴ molecules of NH₃ is 178 gm , i.e. Option B.
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