Mole Concept
Authored by Nurain Johar
Chemistry
University
NGSS covered
Used 658+ times
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15 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
What is the molar mass of NaCl?
58.45g/mol
28g/mol
12g/mol
6.02 x 1023
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Calculate the % composition by mass of oxygen present in H2SO4.
16.3%
65.25%
32.6%
57.14%
Tags
NGSS.HS-PS1-7
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
How many moles are 98.3 grams of aluminum hydroxide, Al(OH)3?
Tags
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Convert 25 g of NaBr to molecules
102.96 molecules
0.24 molecules
1.45x1023 molecules
2.34 x 1020molecules
Tags
NGSS.HS-PS1-7
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the empirical formula for thr compound, CxHyOz , if the ratio C: H: O equal to 2: 2.5 : 1
C2H2O1
C2H5O1
C4H5O2
C3H2O2
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The empirical formula for hydrocarbon A is C2H7O. If the molar mass of the hydrocarbon is 141 g/mol, determine the molecular formula for this hydrocarbon.
C2H7O
C4H14O2
C6H21O3
C8H28O4
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