Respuesta :
Answer:
a. 5.6 L
b. can be find without given mass or Molar mass
Explanation:
Data given:
mole of unknown gas = 0.25 mol
volume of gas = ?
mass of the sample = ?
Solution:
Yes we can find volume of the gas by using its amount of moles.
To find the volume of the gas at STP the following formula can be used
no. of moles = volume of gas / molar volume
Rearrange the above formula
volume of gas = no. of moles x molar volume . . . . . (1)
Where
molar mass of gas = 22.4 L/mol
Put values in equation 1
volume of gas = 0.25 mol x 22.4 (L/mol)
volume of gas = 5.6 L
So the volume of gas is 5.6 L.
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Q. Can you predict the mass of the sample?
To find mass of the gas we must know the molar mass of gas.
if we Know the molar mass of gas the by using ideal gas equation we can find mass of unknown gas
ideal gas equation
PV = nRT . . . . . . .(1)
where
n = m/M . . . . . . (2)
by combining equation 1 and 2 we get following equation
PV = m/MRT . . . . . . .(3)
Now by rearranging equation 3 we can find mass of gas or Molar mass of gas. but one value must be given.
