3. Chemical Reactions

Empirical Formula

객관식
Determine the simplest form of a compound made up of carbon, hydrogen, nitrogen and oxygen if it is made of 49.48% C, 5.19% H and 16.48% O.
1985
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30
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2
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미해결 질문
Some of the formulas below could be either molecular or empirical formulas; however, some could only be molecular formulas. Which of the following formulas must be molecular formulas? Select all that apply.
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객관식
In order to make 1 s’ more, you need 2 graham crackers, 1 piece of chocolate, and 1 marshmallow. How many s’mores can be made from the following ingredients?
7 graham crackers, 6 pieces of chocolate, and 5 marshmallows
1725
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1
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객관식
What is the empirical formula of acetic acid, CH3COOH?
113
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객관식
A compound composed of potassium, manganese and oxygen contains 3.12 g potassium and 1.922 x 10²³ oxygen atoms. If a sample of the compound weighs 12.61 g determine its empirical formula?
1795
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26
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4
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미해결 질문
An example of an empirical formula is
1382
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미해결 질문
A chemist decomposes samples of several compounds; the masses of their constituent elements are listed. calculate the empirical formula for each compound.
910
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객관식
What is the empirical formula for a compound containing 34.4% ethylenediamine, 2.101% Ni, 3.44% sulfate, and 60.06% water by mass?
1070
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미해결 질문
What are the subscripts in the empirical formula of this compound?
1361
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객관식
In an experiment, 10.0 g of sulfur and 10.0 g of oxygen react completely to form an oxide of sulfur. What is its empirical formula?
891
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미해결 질문
A 4.08 g sample of a compound of nitrogen and oxygen contains 3.01 g of oxygen. What is the empirical formula?
1157
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미해결 질문
A sample of an iron-containing compound is 22.0% iron, 50.2% oxygen, and 27.8% chlorine by mass.
1366
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객관식
An unknown compound contains only carbon, hydrogen, and chlorine. Using combustion analysis, you burned 22.56 mg of the sample and collected 7.11 mg of H2O and 52.93 mg of CO2. What is the empirical formula of this compound?
851
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미해결 질문
What is the empirical formula for a compound that is 43.6% phosphorus and 56.4% oxygen?
1169
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미해결 질문
To indicate the number of atoms of each element present in a molecular compound, scientists use -
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