Answer:
a)
b)
c)
d)
Explanation:
The reaction is:
Cr₂O₃(s) + 2Al(s) → 2Cr(s) + Al₂O₃(s)
a) To find the Al mass needed to react with 50 g of Cr₂O₃, we need to calculate the number of moles of Cr₂O₃:
Where:
: is the mass = 50 g
: is the molar mass = 2*52+3*16 = 152 g/mol
Now, the estoichiometric relation between Cr₂O₃ and Al is 1:2, so:
Hence, the mass of Al is:
b) The stoichiometric relation from Cr₂O₃ and Cr is 1:2, hence:
Thus, the mass of Cr is:
c) The number of moles of Cr₂O₃ with a mass of 5 kg is:
So, the mass of Cr is:
d) The mass of Cr produced from 5 tonnes of Cr₂O₃ is:
I hope it helps you!
The correct answer based on the given question above would be the first option. <span>When a perfume bottle is opened, some liquid changes to gas and the fragrance spreads around the room because gases do not have a definite volume. Hope this answer helps.</span>
Explanation:
solution 1) homogeneous
2) do not scatter light
3) cannot be separated by filtration
Colloids 1) heterogeneous
2) scatter light
3) cannot be separated by filtration
suspension 1) heterogeneous
2) may either scatter light or be opaque
3) can be separated by filtration
Milk of magnesia, which is magnesium hydroxide, is used
to cure stomach acidity. The mode of action of this drug is that milk of magnesia
is a base that neutralizes the excess acid present in the stomach, thus
relieving acidity. The answer is letter B.