Chemistry homework help

Posted on 2014-04-03 09:53:00 in Chemistry by CLAIRE

1. A 48 gram sample of impure potassium nitrate (KNO3) was heated to complete decom- position according to the equation

2 KNO3(s) ? 2 KNO2(s) + O2(g)

After the reaction was complete, the volume of the dry gas produced was 2 liters at 122.7?C and 691 torr. How many grams of KNO3 were present in the original sample? (Assume that only the potassium nitrate had decomposed.)

Answer in units of grams



Please help and explain if possible!



Also, if anyone could help with this question it would be great!



005 0.2 points

You are planning an experiment that requires 0.0690 mol of nitrogen monoxide gas (NO). What volume would you need at STP?

Answer in units of L

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