20. Which of the following are pure substances?
1 answer:
You might be interested in
Answer: 12 L fluorine gas at STP can be collected from the decomposition of 90.7 g of
Explanation:
The balanced decomposition reaction is shown as
moles of
According to stoichiometry:
2 moles of gives = 3 moles of flourine gas
Thus 0.36 moles of gives =
of flourine gas
Using ideal gas equation :
P = pressure of gas = 1 atm ( at STP)
V = Volume of gas = ?
n = moles of gas = 0.54
R = gas constant = 0.0821 L atm/Kmol
T = temperature = 273 K ( at STP)
Putting the values we get :
Thus 12 L fluorine gas at STP can be collected from the decomposition of 90.7 g of
Answer:
The grating spacing is
Explanation:
From the question we are told that
The wavelength is
The angle is
The order of the spectrum is
Generally in grating grating the condition for maxima to occur is
where d is the grating spacing
making d the subject of the formula
Substituting values