Answer:
3.6 x 10²²molecules
Step-by-step explanation:
Given parameters:
Mass of ethane gas = 1.8g
Unknown:
number of molecules of ethane gas = ?
Solution:
To solve this problem, we first find the number of moles of ethane gas.
Molar mass of ethane, C₂H₆ = 2(12) + 6(1) = 30g/mol
Number of moles =
Insert the parameters and solve;
Number of moles =
= 0.06mole
1 mole of a substance contains 6.02 x 10²³ molecules
0.06mole of ethane will contain 0.06 x 6.02 x 10²³ = 3.6 x 10²²molecules