Q3
The total number of atoms in 8.5 gm of NH3 is __________ × 1023.
A.
9.03
B.
3.01
C.
12.04
AnswerD.
6.02
Answer: Option C
Solution
Answer: Option C
Solution:
The molecular weight of NH3 is 17 g/mol (Nitrogen = 14, Hydrogen = 1 × 3 = 3). For 8.5 grams of NH3, the number of moles is calculated as:
Moles of NH3 = 8.5 / 17 = 0.5 moles.
The total number of molecules in 0.5 moles is:
0.5 × 6.02 × 1023 molecules.
Since each molecule of NH3 contains 4 atoms (1 nitrogen and 3 hydrogen), the total number of atoms is:
0.5 × 6.02 × 1023 × 4 = 12.04 × 1023 atoms.