What subatomic particle always defines which element an atom is?
1 answer:
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Answer:
6.02 x 10²²molecules
Explanation:
Given parameters:
Mass of CO₂ = 4.4g
Unknown:
Number of molecules in CO₂ = ?
Solution:
To find the number of molecules in the given mass, we have to find the number of moles in the compound first;
Number of moles =
Molar mass of CO₂ = 12 + 2(16) = 44g/mol
Insert the parameters and solve;
Number of moles = = 0.1mol
1 mole of a substance contains 6.02 x 10²³molecules
0.1 mole of CO₂ will contain 0.1 x 6.02 x 10²³molecules
= 6.02 x 10²²molecules
Answer:
1.389 moles
Explanation:
We are given that
Given mass of ammonium=25.0 g
We have to find the number of moles in 25.0g of ammonium.
The chemical formula of ammonium
Molar mass of N=14, Molar mass of H=1
Molar mass of ammonium (NH4+)=14+4(4)=18 g/mol
We know that
Number of moles=Given mass/Molar mass
Using the formula
Number of moles of ammonium=moles
Number of moles of ammonium=1.389 moles
Hence, the number of moles in 25.0g of ammonium=1.389 moles