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The Mole Test Practice (2nd part)

Authored by A Santn

Chemistry

9th - 11th Grade

NGSS covered

The Mole Test Practice (2nd part)
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14 questions

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1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Find the Molar Mass of:
Ga2(SO3)3

280 g/mol
400 g/mol
380 g/mol
480 g/mol

2.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the mass of 2.50 mol of oxygen gas O2?

40 g
80 g
16 g
32 g

Tags

NGSS.HS-PS1-7

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which expression below show the correct method of determining the percent composition of Sodium in Na2CO3?

%Na = (22.99g/106g) x 100
%Na = (22.99g/106) / 100
%Na = (45.98g/106g) x 100
%Na = (106/45.98g) x 100

4.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

How many moles are in 16.94g of water?

16.94 mol H2O
0.9401 mol H2O
305.3 mol H2O
1.063 mol H2O

Tags

NGSS.HS-PS1-7

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the empirical formula of the following molecular formula:  C3H6

C3H6
CH2
C2H4
CH3

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Find the percent composition of Cu2S?

%Cu= 67.987 %S= 32.013
%Cu= 79.854   %S= 20.145
%Cu= 35.946   %S= 64.054

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A formula with the lowest whole # ratio of elements in a compound is called

Molecular Formula
Chemical Formula
Empirical Formula 
Distance Formula

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