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its not B or C as they are in diff directions before and after collision. its D because V2-V1 will give the resultant momentum after collision and adding the momentums before collision gives resultant as well.
its not B as the moles are wrong. 20% of steam lost means 0.8 mole steam left and as steam and H2 are in 1:1 ratio, 20% loss in steam is 20% gain in H2 so H2 mole is 0.2 and O2 is 0.1
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