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
allsm [11]
4 years ago
10

A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the followi

ng hydrocarbon: C 7 H 16 .
Enter the percentages of carbon and hydrogen numerically to four significant figures, separated by commas.
Chemistry
1 answer:
Katena32 [7]4 years ago
7 0
C7H16, where C=12.01, and H=1.01, so the weight of the molecule would be 7(12.01)+16(1.01), or 100.23. The percentage of carbon would be found by ((7*12.01)/100.23)*100=83.88% Carbon
((16*1.01)/100.23)*100=16.12% Hydrogen
You might be interested in
PLEASE HELP! Class is almost ending, I don't want to repeat.
nikklg [1K]
ANSWERS:

1. 2KClO_{3} ⇒ 2KCl + 3O_{2}

2. H_{2}  C_{2} O_{4}  + 2NaOH ⇒ Na_{2}  C_{2} O_{4}  + 2 H_{2} O

3. 2 C_{10}  H_{22} +  31O_{2} ⇒ 20C O_{2} + 22 H_{2} O

4. 4 H_{2} + Fe_{3} O_{4} ⇒ 3Fe +4 H_{2} O

5. 4P + 5 O_{2} ⇒ 2 P_{2}  O_{5}


I have attached my work for 1-3. I would like to see if you can get 4 and 5 on your own. but, if you are struggling/copnfused please let me know in the comments! :)

6 0
4 years ago
A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast were they running ?
madam [21]
Hi Alex, thanks for asking a question here on Brainly!

We can figure how the fast the person is running by dividing the minutes by the seconds. 

\frac{5m}{sec}
= \frac{300m}{min}
= \frac{18km}{hr}

The person was running 18 km/hr. ✅ 

Hope that helps! ★ If you have further questions about this question or need more help, feel free to comment below or post another question and send the link to me. -UnicornFudge aka Nadia.
3 0
4 years ago
100 points!!!!! answer only if known
navik [9.2K]
It is always the same as it was before the collision because there is no outside forces it is left with the same amount of energy throughout thee collision.
3 0
4 years ago
Read 2 more answers
A student has a rectangular block. It is 2 cm wide. 3 cm tall and 25cm long. It has a mass of 600 g. First, calculate the volume
Klio2033 [76]

Answer:

The area of the block is 150 cm

Explanation:

8 0
3 years ago
Describe two different causes of the force of attraction in a chemical bond
gregori [183]
So here are the two different causes of the force of attraction in a chemical bond. The two different causes of the force of attraction would be the <span>attraction between the p+ nucleus of one and the e- of another atom and the attraction of a positive ion and a negative ion. Hope this is the answer that you are looking for. </span>
4 0
3 years ago
Other questions:
  • What if cell differentiation did not occur?
    12·1 answer
  • For the following reaction KClO4 → KCl + 2O2 Assign oxidation states to each element on each side of the equation.
    9·1 answer
  • A student uses a pH meter to measure the acidity of a water sample from a lake. For what purpose is the student MOST likely test
    15·1 answer
  • How does bias in the data affect experimental results?
    15·2 answers
  • Which is NOT true about new scientific theories?
    6·2 answers
  • Please help only 1 day to go to school
    7·2 answers
  • What is the chemical formula of diphosphorus monoxide?
    10·1 answer
  • Select the correct answer.
    14·2 answers
  • What are the main differences between alkaline and alkali?.
    6·1 answer
  • How will you separate a solution of benzene and chloroform?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!