Answer:
7.6125
Explanation:
multiply 7.5 with 1015
yll got 76125 divide it by 1000 to get answer in grams
The mass in grams of 7.5 × 10¹⁵ molecules of ammonia is 21.08 × 10⁻⁸ g.
Mass of any substance from moles will be calculatd as:
n = W/M , where
W = required mass
M = molar mass
We know that in 1 mole of any substance 6.022 × 10²³ particles of that sybstance are present.
No. of moles in 7.5 × 10¹⁵ = 7.5 × 10¹⁵molecules / 6.022 × 10²³ molecules per mole
No. of moles in 7.5 × 10¹⁵ = 1.24 × 10⁻⁸ moles
Molar mass of ammonia = 17 g/mol
Now we put the requred values on the first equation to get the mass as:
W = (1.24 × 10⁻⁸mol)(17 g/mol)
W = 21.08 × 10⁻⁸ g
Hence required mass of ammonia is 21.08 × 10⁻⁸ g.
To know more about moles, visit the below link:
https://brainly.com/question/24639749
