Empirical formula and molecular formula

Empirical formula and molecular formula

10th Grade

10 Qs

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Empirical formula and molecular formula

Empirical formula and molecular formula

Assessment

Quiz

Chemistry

10th Grade

Practice Problem

Medium

Created by

Nidal Khalil

Used 118+ times

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10 questions

Show all answers

1.

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

2.

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

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the percentage of oxygen in carbon dioxide? (CO2)

27.3%
72.7%
30%
70%

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

SO
SO2
SO3
SO4

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?

C3H8
CH4
C2H2
C4H10

6.

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

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the percentage of iron in iron(III)oxide?

30%
70%
40%
60%

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