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WorksheetsMole Concept
Total questions: 15
Worksheet time: 45mins
What is the molar mass of NaCl?
58.45g/mol
28g/mol
12g/mol
6.02 x 1023
Calculate the % composition by mass of oxygen present in H2SO4.
16.3%
65.25%
32.6%
57.14%
Convert 25 g of NaBr to molecules
102.96 molecules
0.24 molecules
1.45x1023 molecules
2.34 x 1020molecules
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
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
Calculate the percentage of composition by mass of oxygen in Al(HCO3)3.
22.86 %
68.57 %
78.26 %
40.50 %
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
NaPO2
Na2PO3
Na3PO4
NaPO4
Which of the following statement are true about the formula of dinitrogen monoxide, N2O?
The relative molecular mass is 28.
One molecule of N2O consists of one nitrogen atom and one oxygen atom.
One mole of N2O contains 6.02 x 1023 atoms of nitrogen.
One mole of N2O consists of two mole of nitrogen atom and one mole of oxygen atom.
The mass of 4.50 x 1022 Cu atoms is ___________
4.75 g
63.55 amu
7.47 x 10-2 g
7.47 x 10-2 amu
Identify the number of Chlorine atoms in 65.8 g CaCl2.
7.14 x 1023 atoms
8.71 x 1023 atoms
1.22 x 1023 atoms
3.57 x 1023 atoms
Determine the number of moles of Na2CrO4 that contain 4.33 x 1024 oxygen atoms. Given the Avogadro’s number, NA is 6.02 x 1023.
7.19 mol
6.77 mol
1.80 mol
64.00 mol
What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
C3H8
CH4
C2H2
C4H10
