KINETICS plz help

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In a reaction NH₄NO₂ â†’ N₂(g) + 2H₂O (l) the volume of N₂ after 20 mins and after a long time is 40ml and 70ml respectively ...the value of rate const is:
a)(1/20)ln(7/4) /min
b)(2.303/1200)log(7/3) /sec
c)(1/20)log(7/3) /min
d)(2.303/20)log(11/7) /min

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