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
nikitadnepr [17]
2 years ago
10

BRAINLIEST IF RIGHT!! Write 200.0398 in 2 sig figs.

Chemistry
2 answers:
IgorC [24]2 years ago
8 0

Answer:

20

step by step explanation:

Archy [21]2 years ago
3 0
The answer would be 200
You might be interested in
Write the balanced chemical equation for the reaction of glucose (C6,H12,O6) with oxygen gas to produce carbon dioxide gas
Fittoniya [83]

Answer:

C6H12O6+6O2=6Co2+6H2o

4 0
2 years ago
Help?
trasher [3.6K]
Separate the components of a mixture.
7 0
2 years ago
Read 2 more answers
What is the name for Cl₇Br₄ *
Margarita [4]

Answer: no se wey jaja que le pusiste tu ?

Explanation:

4 0
2 years ago
At which pesan pressure lowest The image shows a representation of mountains of various heights, numbered 1, 2, and 3 The plami
ira [324]

1 is the lowest pressure.........

4 0
2 years ago
How much heat in kj is released by burning 9.5 grams of methane?
tatyana61 [14]
Methane is the compound CH4, and burning it uses the reaction:

CH4 + O2 -> CO2 + H2O, which is rather exothermic. To find the heat released by burning a certain amount of the substance, you should look at the bond enthalpy of each compound, and then compare the values before and after the reaction. In methane, there are 4 C-H bonds, which have bond energy of 416 kj/mol, resulting in a total bond energy of 1664 kj/mol. O2 is 494 kj/mol. Therefore we have a total of 2080 kj/mol on the left side. On the right side we have CO2, which has 2 C=O bonds, each at 799 kj/mol each, resulting in 1598 kj/mol, and H2O has 2 O-H bonds, at 459kj/mol each, resulting in a total of 2516 kj/mol on the right hand side. Now, this may be confusing because the left hand side seems to have less heat than the right, but you just need to remember: making minus breaking, which results in a total change of 436kj/mol heat evolved.

Now it is a simple matter of find the mols of CH4 reacted, using n=m/mr.

n = 9.5/16.042 = 0.592195 mol

Therefore, if we reacted 0.592195 mol, and we produced 436 kj for one mol, the total amount of energy evolved was 436*<span>0.592195 kj, or 258.197 kj.</span>
7 0
3 years ago
Other questions:
  • he decomposition of acetaldehyde, CH3CHO, was determined to be a second order reaction with a rate constant of 0.0771 M-1 s-1. I
    13·1 answer
  • During respiration, energy is retrieved from the high-energy bonds found in certain organic molecules. Which of the following, i
    8·1 answer
  • What is the mass (in grams )for 88.624moles of silver (Ag )? ( round your answer to a whole number (no decimal )
    6·1 answer
  • Is the following nuclear equation balanced?<br><br><br> yes<br> no
    14·2 answers
  • If 0.500 L of a 4.00-M solution of copper nitrate, Cu(NO3)2, is diluted to a volume of 1.50 L by the addition of water, what is
    11·1 answer
  • What type(s) of atoms make up the element carbon?
    13·2 answers
  • Crossing a Dd parent with another Dd parent results in
    7·1 answer
  • Help! Im gonna fail if i dont get the answer.
    14·2 answers
  • 25. How is the information in an image sent through the digital signal system?
    5·2 answers
  • 4. At least one carbon-carbon bond in an alkyne is a triple covalent bond. Other bonds may be single or double carbon-carbon bon
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!