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
Leni [432]
3 years ago
10

When 1 mol of methane is burned at constant pressure, −890 kJ/mol of energy is released as heat. If a 3.72 g sample of methane i

s burned at constant pressure, what will be the value of ∆H? (Hint: Convert the grams of methane to moles. Also make sure your answer has the correct sign for an exothermic process.) Answer in units of kJ.
Chemistry
1 answer:
Nonamiya [84]3 years ago
8 0

Answer:

-206.9kJ

Explanation:

Heat of combustion = -890kJ/mol

Mass of methane burnt = 3.72g

Unknown:

Heat liberated  = ?

Solution:

Heat of combustion is the heat liberated when one mole of an element or compound is burnt completely in excess oxygen gas.

    To solve this problem;

   Find the number of moles of methane;

             Number of moles  = \frac{mass}{molar mass}

 Molar mass of CH₄   = 12 + 4(1) = 16g/mol

     Number of moles = \frac{3.72}{16}   = 0.23moles

Now, heat liberated by 0.23mol of methane  =  -890kJ/mol x 0.23mol

                                                                          = -206.9kJ

You might be interested in
Look at the reaction below. Upper H subscript 2 upper S upper O subscript 4 (a q) plus upper Upper M g (s) right arrow Uper M g
Maslowich

Answer: D

H_2SO_4(aq)

Explanation:

Took it on edg and got it correct.

4 0
3 years ago
Read 2 more answers
1. If a car is traveling 90 mi/hr, how many feet will the car travel in 1 sec? In 5 sec?
Fudgin [204]

Answer:

The car travel 660 feet

Explanation:

First convert the Speed into <u>Feet/sec</u>

Speed of the car = 90 mi/hr

1 mi = 5280 ft

In 90 miles = 90 x 5280 = 475,200  feet

1 hr = 60 min

1 min = 60 sec

So ,

1 hr = 60 x 60 sec = 3600 sec

The speed is defined as the distance traveled by the object in unit time. The formula of speed is :

Speed =\frac{distance}{time}

Speed =\frac{90mi}{1hr}... given

Speed =\frac{475200 ft}{3600sec}

Speed = 132 ft/sec

Now,  time = 5 sec

Speed =\frac{distance}{time}

distance =speed\times time

distance = 132ft/sec\times 5sec

Distance = 660 feet

3 0
4 years ago
Convert 15.6 cm to m
Olin [163]
There is 100 centimeters in 1 meter


Divide 15.6 with 100

15.6/100 = 0.156

0.156 meters is your answer

hope this helps
4 0
3 years ago
Select all of the elements that are classified as metals.
ASHA 777 [7]

Answer:

Gold, sodium, aluminum

Explanation:

The metals are located on the left side of the periodic table

4 0
3 years ago
Read 2 more answers
Which of the following can't be broken down any further chemically?
Y_Kistochka [10]
D) elements should be the right answer
6 0
3 years ago
Other questions:
  • If the partial pressure of carbon dioxide gas in a blood capillary is 45 mm hg, what is the pressure expressed in inches of merc
    8·1 answer
  • Which conversion factor correctly shows the relationship between moles and representative particles?
    14·1 answer
  • when acceleration is held constant and objects of different mass are observed,are mass and force directly proportional or invers
    12·1 answer
  • Friends can __________.
    10·2 answers
  • Which of the following metals is
    12·2 answers
  • How can an organism be dead and still be considered a population or a<br> community?
    9·1 answer
  • HELPPPPP WILL MARK BRAINLIEST
    6·2 answers
  • Just like plants, animals need glucose in order to produce ATP through cellular respiration,
    8·2 answers
  • 1 You place a 28.95-g piece of gold in a 10-ml graduated cylinder. The level of the water rises 1.50 mL. What is the density of
    14·1 answer
  • Help!!!
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!