Comments on: O Levels Chemistry Questions: Mole Concepts / Mole Calculations

By: bilal

bilal — Fri, 26 Feb 2010 12:47:24 +0000

2m————-4g
x—————8
H2 =4m

2m—————32g
x—————-8g
O2=0.5 m so it is limiting reactant

32—————36
8g————–x
x =9
so ans for 1 is A

2) x+3/100 = 3/10

x = 27 so ans = A

3) i did not uderstand

4) D

MUSKAAN — Thu, 12 Nov 2009 04:39:44 +0000

FOR 4
C(6)

MEHAK — Thu, 12 Nov 2009 04:35:52 +0000

oh sorry there is a mistake it should be D(6)

MEHAK — Thu, 12 Nov 2009 04:34:27 +0000

D.I think it should be C b/c sodium ion is surrounded by 6 Cl ions

waleed bin qasim — Fri, 09 Oct 2009 15:03:36 +0000

1.D
2.A
3.B
4.A

pliz grade sir