35.
One molecule of a compound, ZY3, is shown in a dot-and-cross diagram.
XX
Key
• =Z
36.
Y
XX
•X
Y
Z
Y
XX
The elements represented by Z and Y could be
ABCD
Z
aluminium
phosphorus
aluminium
phosphorus
Y
hydrogen
oxygen
chlorine
chlorine
XX
X=Y
The equation shows the formation of sulphur trioxide in the contact process.
2S02(g) + O2(g)
=
2S03(g)
Which statement is true about this equation?
A
2 g of SO₂ react with 1 g of O₂ to give 2 g of SO3.
B
C
D
6 atoms of SO₂ react with 2 atoms of O2 to give 6 atoms of SO3.
0.5 moles of SO, react with 0.5 moles of O₂ to give 0.5 moles of SO3.
12.80 g of SO, react with 3.2 g of O₂ to give 16.0 g of SO3
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