1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
VMariaS [17]
3 years ago
13

What is the percent composition by mass of oxygen in ca(no3)2 (gram-formula mass = 164 g/mol)?a.9.8%b.29%c.48%d.59%?

Chemistry
2 answers:
Mila [183]3 years ago
8 0
Percent composition by mass of oxygen =
((16.0*6)/(40.1+2*(14.0+16.0*3)))*100%
= 58.5%
therefore, the answer is D
iris [78.8K]3 years ago
4 0

Answer:

A. 9.8%

Explanation:

Percentage Composition = (Mass of element /  Mass of compound) * 100

Mass of oxygen = 16g

Molar mass of Ca(NO3)2

Where;

Ca = 40

N = 14

O =16

Molar mass = 40 + 2[14 + 3(16)] = 164

Substituting into the formular;

Percentage composition = (16 / 164) * 100

Percentage Composition = 0.0975 * 100

Percentage Composition = 9.75% ≈ 9.8 %

Correct option = A

You might be interested in
What what is the density. Correct units please.
CaHeK987 [17]
D=mxv so your answer should be 269.37
8 0
3 years ago
What does phenolphthalein turn pink?
Alex Ar [27]

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols for use in experiments.

8 0
2 years ago
if 30.0L of oxygen are cooled from 200 degrees celsius to 1 degree celsius at constant pressure, what is the new volume of oxyge
Sergio039 [100]

Answer: 18.65L

Explanation:

Given that,

Original volume of oxygen (V1) = 30.0L

Original temperature of oxygen (T1) = 200°C

[Convert temperature in Celsius to Kelvin by adding 273.

So, (200°C + 273 = 473K)]

New volume of oxygen V2 = ?

New temperature of oxygen T2 = 1°C

(1°C + 273 = 274K)

Since volume and temperature are given while pressure is held constant, apply the formula for Charle's law

V1/T1 = V2/T2

30.0L/473K = V2/294K

To get the value of V2, cross multiply

30.0L x 294K = 473K x V2

8820L•K = 473K•V2

Divide both sides by 473K

8820L•K / 473K = 473K•V2/473K

18.65L = V2

Thus, the new volume of oxygen is 18.65 liters.

5 0
3 years ago
Based on your solubility rules which of the following compounds would form a precipitate water?
Novosadov [1.4K]
H2SO4+NaOH=Na2SO4+H2O
3 0
3 years ago
Food couldn’t reach the stomach without the esophagus and the _? please help only correct answers.
expeople1 [14]
<span>Food couldn’t reach the stomach without the esophagus and the throat.</span>
3 0
3 years ago
Other questions:
  • In the induced fit model of enzymes, a substrate associates itself with which part of an enzyme?
    13·1 answer
  • What did J.J. Thomson’s experiments with cathode ray tubes imply about the mass of an electron?
    5·1 answer
  • According to the MSDS, which best describes propane?
    5·1 answer
  • A sample of O2 gas (2.0 mmol) effused through a pinhole in 5.0 s. It will take __________ s for the same amount of CO2 to effuse
    7·1 answer
  • As shown in the image above, the Earth's outermost layer is divided into several tectonic plates. Which of the following is true
    8·1 answer
  • A mixture of gases with a pressure of 800.0 mm hg contains 60% nitrogen and 40% oxygen by volume. what is the partial pressure o
    5·1 answer
  • A student mixed a small amount of iron filings and sulphur powder in a dish. He could not
    15·1 answer
  • NO2 is added to the reaction to speed it up. In which form would this substance be a homogeneous catalyst for this reaction?
    6·1 answer
  • The sidewalk outside is covered in ice what kind of shoes should i wear to walk on the ice explane
    6·1 answer
  • Some people have one sickle cell gene and one normal gene. They have few defctive cells and no symptoms because the sickle cell
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!