Chemical Calculations

Quiz
•
Chemistry
•
10th - 11th Grade
•
Medium
Mark Simpson
Used 33+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Calculate the Mr of Na2SO4.10H2O
142
178
322
161
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Calculate the number of moles in 25.25g of KNO3
2
0.25
0.75
4
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Calculate the mass of 0.5 mol of NaOH
15g
10g
20g
40g
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Scheelite is an ore of tungsten.
The main compound in scheelite has the percentage composition by mass
Ca = 13.9%, W = 63.9%, O = 22.2%.
Calculate the empirical formula of this compound. [Ca=40,W=184,O=16]
CaWO
CaWO3
CaWO4
Ca2W2O3
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Calculate the empirical formula of the compound with the following composition by mass:
26.6% K, 35.4% Cr, 38.0% O
[K=39, Cr=52, O=16]
K2Cr2O7
KCrO4
K2CrO4
KCrO3
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Find the empirical formula of the compound formed in the reaction of 10.800g of magnesium to form 18.000g of an oxide. [Mg=24, O=16]
MgO
MgO2
Mg2O
Mg2O2
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
A compound of carbon, hydrogen and nitrogen only has the following composition: C 77.4%, H 7.5%, N 15.1%. What is the empirical formula of the compound? [C=12,H=1,N=14]
C6H8N
C6H6N
C6H7N
CHN
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