<p>Which of the following is the density of nitrogen at STP?</p>
<p>(A) 0.33 g/L<br>
(B) 0.65 g/L<br>
(C) 0.80 g/L<br>
(D) 1.25 g/L<br>
(E) 1.60 g/L </p>
<p>This is from the spark notes #2 test and their explanation is 1.25 because at STP there is 1 mol per 22.4 L which means 28g of nitrogen per 22.4L which translates to 1.25g/L. So why is it that water has a density of 1g/L when according to this logic it should only be 18/22.4L?</p>
<p>stp is for gases… density of water is concerning liquid water</p>
<p>ok thanks.</p>
<p>no problemo</p>
<p>i know this is an easier calc problem…but will calculations get much harder than this without a calculator? thanks</p>
<p>^ You wouldn’t even need to calculate for this. 28/22 is definitely greater than 1, so A B C are out. It’s less than 1.5 because 1.5 = 33/22. The only answer between 1 and 1.5 is 1.25
And calculations usually work out very nicely, so don’t stress over them. </p>
<p>@ OP: a better explanation would be that only gases occupy 22.4 L /mol at STP. You can still have a liquid at STP (273 K 1 atm), but 1 mol of it probably won’t occupy 22.4 L.</p>