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At STP, which sample contains the same number of molecules as 11.2 liters of CO2(g) at STP?
(1) 5.6 L of NO2(g) (3) 11.2 L of N2(g)
(2) 7.5 L of H2(g) (4) 22.4 L of CO(g)

Sagot :

lulu1991
The answer is (3) 11.2 L of N2(g). When the choices are all gases, the number of molecules depends on the molar number of the gas. Under the condition of STP, the molar number of a gas is depends on volume only. So the same volume of gas has the same number of molecules.
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