Ocr f321 23 may 2013~official discussion thread

I did that but I've checked online and we were meant to do the 0.05 moles times by avogadro's constant. We'll probably get 2 out of 3 marks though.

http://www.ehow.com/how_8463162_number-molecules-compound-given-grams.html

I thought that didn't matter. I thought 1 mol was 6.02X10^23 for any particles. So like 1 mole of a grain of sand= 6.02X10^23 sand compound. So wouldn't 1 mol of a molecule just be 6.02X10^23 molecules?

Did anyone get 3.01 x 10^22 for the avongardo constant q?

The paper was different, although, some questions that came up were on past papers so I was pretty pleased with that. The table at the end was weird, wasn't too sure what it was asking for in the last row for fluorine. Does anyone know?

yeah that's fine...nh3 was at the top

I put forces BETWEEN fluorine molecules as its VDW forces? Not sure though :/

What ion was resonsible for bleaching?

What ion was resonsible for bleaching?

I did that but I've checked online and we were meant to do the 0.05 moles times by avogadro's constant. We'll probably get 2 out of 3 marks though.

http://www.ehow.com/how_8463162_number-molecules-compound-given-grams.html

ClO^-

people are saying it's Perm-perm dipole interactions for PH3

no? OH-

Ugh that's soooo annoying! Why the hell was it 3 marks then And I got the NH3 hydrogen bonding question wrong too! Came out of the exam thinking I had done well until I came on this thread

...water of crystalisation question.

I put OH^- as a random guess cuz I saw hydroxide in the question but it's CLO^- for sure. My teacher said it and I looked it up on google as well.

I got 16. anyone else?

I got 16. anyone else?