calculate the number of hydrogen atoms in 68 g of ammonia
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=4mol
Explanation:
NH
3
Molecular weight = 14+3×1
=17
No. of moles =
molecularweight
gramweight
=
17
68
(given)
=4mol
Answered by
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The formula mass of ammonia = 14+1×3 = 17 .
The number of moles in 68 g ammonia = 68/17 =4 mol
A mole is 6.022×10²³ ,
so the number of hydrogen atoms in 4 moles of ammonia = 4 x 6.022 x 10²³ x 3
= 72.26 x 10²³ atoms
= 7.26 x 10²⁴ atoms
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