Calculate the amount (in moles) of gas which occupies 250cm³ at STP

0.01

Explanation:

volume of 22.4 L (22,400 ml) at s.t.p. 250 ml out of 22,400 ml is 0.01 rounded, therefore I assume that is the answer. About 0.01 mole occupies 250 cm3 at s.t.p.

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