# Ideal gas equations and other stuffWatch

#1
so firstly I was hoping someone could check my work done so far:

1. Calculate the amount of substance in moles in:
a) 250cm3 of a 1.00mol dm-3 solution --- * 0.25 mol
b) 10.0cm3 of a 0.200 mol dm-3 solution---* 0.002 mol

2. Calculate the concentration, in g dm-3 for:
a) 2.00mol of NaOH in 4.00dm3 of solution---* 0.5 gdm-3
b) 0.500mol of HN03 in 200cm3 of solution---* 2.5 gdm-3

3. Calculate the amount of substance in mol, in the following gas volumes at RTP:
a)1440 dm3 O2(g) ---* 60 mol
b)720 cm3 He (g)---* 0.03 mol
c)34.0 cm3 H2 (g)---* 0.0014 mol?

Thank You
0
1 year ago
#2
The first two are defo correct I’m doing the same summary questions as you at the moment, however for question 2a) I’m not too sure but I got 0.5moldm-3 aswell but because it asks for it in g/dm3 I think you need to Times X the concentration (0.5) by the RFM of NaOH which is 40, so that is 0.5moldm-3 X 40 = 20g/dm-3 Again I’m not 100% sure but look at page 27 underneath the worked example: standard solution - *other ways of showing concentration* in chem OCR.Hope this helps xx
Also I haven’t finished the questions yet I will do by tomorrow and let you know if I got the same answers aswell
0
1 year ago
#3
All your answers are correct, the only thing different is that I did an extra step on the question 2’s

Anyway, have you done question 4?
0
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