CHEMISTRY HIGH SCHOOL

What is the percent by mass of oxygen in propanal, CH3CH2CHO?(1) 10.0% (3) 38.1%(2) 27.6% (4) 62.1%

Answers

Answer 1

Answer:

Answer : The percent by mass of oxygen in propanal is, 27.58 %

Solution : Given,

Molar mass of carbon = 12 g/mole

Molar mass of hydrogen = 1 g/mole

Molar mass of oxygen = 16 g/mole

First we have to calculate the molar mass of propanal, $CH_3CH_2CHO$

Molar mass of propanal, $CH_3CH_2CHO$ = $3(12)+6(1)+16=58g/mole$

Now we have to calculate the percent by mass of oxygen in propanal.

$\text{Percent by mass of oxygen}=\frac{\text{Mass of oxygen}}{\text{Mass of propanal}}* 100=(16)/(58)* 100=27.58\%$

Therefore, the percent by mass of oxygen in propanal is, 27.58 %

Answer 2

Answer: 17.6% oxygen
% mass = molar mass of part over molar mass of whole,
molar mass of oxygen is 16
molar mass of carbon is 12
molar mass of hydrogen is 1
so (16) / (16+12*6+3) = 16/91 = 17.58%

Related Questions

Bond the following atoms. Determine if they are ionic or covalent, circle your choice. Show the valence electrons and how they are either shared between the atoms or how they are transferred between atoms. Then write the chemical formula in the space provided.Ionic or covalentC ClFormula ____________ Ionic or covalentMg ClFormula _____________
A cube measures 3.0 cm on each side and has a mass of 25g what is the density of the cube?
Which of the following bonds can form between atoms of equal electronegativity? A) Covalent bond B) Ionic bond C) Hydrogen bond D) Metallic bond
The mass number of an isotope of uranium is 238, and its atomic number is 92. Which symbol best represents this isotope of uranium?
Which process can you blame if you burn your finger on a metal utensil sitting in a pot of extremely hot water

Smooth muscles can be found in each of the organs below exceptA. the stomach
B. the small intestine
C. the heart
D. the large intestine

Answers

c. the heart

Smooth muscles are the type of muscles that can be found in the organs like the stomach, the small intestine and the large intestine however, smooth muscles cannot be found in the heart. A smooth muscle is also called as the involuntary muscle which means that it cannot be controlled and that it contracts or expands without you telling these muscles to do so. They can also be found on the walls of the other inner organs like the bladder, uterus and blood vessels. These type of muscles has longer or almost permanent contractions compared to that of the skeletal muscles.

C, the heart, because the heart is Cardiac Muscle.

Which statement defines the heat capacity of a sample?

Answers

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

The answer is "the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure"

Answer:

Explanation:

I just took the test twice and it wasn't D the first time

Which laboratory test result can be used to determine if KCl(s) is an electrolyte?(1) pH of KCl(aq)
(2) pH of KCl(s)
(3) electrical conductivity of KCl(aq)
(4) electrical conductivity of KCl(s)

Answers

Answer: (3) electrical conductivity of KCl (aq)

Explanation: pH is the measure of acidity or alkalinity.

Conductance is the ability of a substance to be able to conduct electric current through it. Electrolyte is a solution which enables electric current to pass through them due to the presence of ions.

Ionic compounds do not conduct electricity in solid state as the ions are strongly held by strong coloumbic forces but in aqueous solutions they dissociate into ions and thus act as good conductors.

$KCl(aq)\rightarrow K^+(aq)+Cl^-(aq)$

The answer is (3) electrical conductivity of KCl(aq). The definition of electrolyte is that the substance that will ionize when dissolving in suitable ionizing solvent like water.

An article about half-lives describes a daughter isotope. What is a daughter isotope?

Answers

A daughter isotope is a part of the decay chain process in which the parent isotope undergoes the decaying process in the nuclear reaction and as a result, it forms daughter isotopes. Daughter isotopes can also have their own daughter isotopes if they want.

The answer should be A, the daughter isotope is the isotope formed from the less stable one (parent)

hope this helps :)

Gross Domestic Product includes consumption, net exports, _____, and _____. investments, government expenses intermediate goods, services last year's products, this year's products

Answers

Answer: The correct answer for the blank is-

Investments and government expenses.

Gross domestic product (GDP) is the total goods and services value, which is produced within the boundary of a country during a particular year.

GDP is measured by expenditure method, which includes investment, government expenditure, net exports (Exports-Imports), and consumption.

Thus, investments and government expenses is the right answer for the blanks.

Answer:

A) investments, government expenses

Explanation:

I got it right on Odyssey!

What is the reaction when magnesium becomes magnesium oxide

Answers

Magnesium and oxygen reacting to form magnesium oxide is a synthesis reaction. This reaction occurs when many reactants proceeds to reaction forming a single product. Synthesis reactions release energy in the form of light or heat, therefore they are exothermic reaction.

Other Questions

This element is often used to block out dangerous radiation.a. lead b. carbon-12 c. uranium-236 d. uranium-238

What is global warming? a) a recent increase in the average global temperature near Earth’s surfaceb) a period of time when temperatures across the planet are colder than normal c) a characteristic of summer that returns seasonallyd) the gain of heat in coastal areas from El Niño storms

Which is a unique feature of Jupiter? A. the least dense planet in the solar system B. the largest, most massive planet C. rotates on an axis tilted entirely sideways D. the most distant planet from the sun

A mining crew extracted two different types of minerals from the underground. Then, they transferred the same amount of energy into both minerals. Why did mineral A change while mineral B stayed the same? Explain what happened to the molecules of both minerals.