The correct answer should be D. can be real or virtual depending on the object's placement
Depending on the position on the mirror, it can be determined whether the object is real or virtual.
To Find :
The STP moles of 67.2 L CO.
Solution :
We know, molar volume at STP is used to converted into moles by :
1 moles = 22.4 L STP
So, number of moles in 67.2 L CO is :
Therefore, number of STP moles are 3.
Hence, this is the required solution.
The empirical formula Of Tin oxide is calculated as follows
Find the mass of oxygen = 0.635 - 0.500 = 0.135
then calculate moles of each element
moles =mass/molar mass
that is Tin(Sn) = 0.500/118.71 = 4.21 x10^-3 moles
for oxygen= 0.135/16= 8.44 x10 ^-3 moles
find the mole ratio by dividing with the smallest mole (4.21 x10^-3)
Sn = ( 4 .21 x10^-3) / (4.21 x10^-3)= 1 mole
O= (8.44 x10^-3 ) /(4.21 x10^-3) = 2 mole
therefore the empirical formula = SnO2
It'll beginning to evaporate.