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Mole Concept

Authored by Nurain Johar

Chemistry

University

NGSS covered

Used 646+ times

Mole Concept
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15 questions

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1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Media Image

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

Media Image

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?

1.26 moles
0.8 moles
7,673.4 moles
150 moles

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?

Mg4N3
MgN2
Mg3N
MgN

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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