Volume Question

[airstrikee]

2KClO3 --> 2KCl + 3O2

if 10.0g of KCLO3 decomposes at 25C and 755 mmHg, what volume of O2 is produced?

answer is [(30/246)(.0821)(298)]/[755/760]

where did the 760 come from?

this question is from the dat destroyer

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[airstrikee]

nevermind i see, it is to convert from mmhg to atm