Outage Notification

The key may be wrong for #37 and #51

Hi Yoko,
You are correct the answer for #37 is incorrect and the answer for #51 is correct.  Thank you for bringing this to our attention.

For #51, the question is asking about 56g of N2.  That should be 1.17 moles of N2.  (the answer key says 2 moles.  Maybe you meant to say 48g of N2). Part b uses this value to calculate the total number of moles of gas, so the final answer will be different.

Hi Yoko,
The molar mass of Nitrogen is 14.00 g, which means the molar mass of N2 is 28.00 g.  56 g N2 x 1 mole/28 g = 2 moles.

oops.  Of course.  I don't know why I thought that!