Answers
Answer: The enthalpy change for this reaction is, -803 kJ
Explanation:
The balanced chemical reaction is,
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)[/tex]
The expression for enthalpy change is,
[tex]\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)][/tex]
[tex]\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+(n_{H_2O}\times \Delta H_{H_2O})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{CH_4}\times \Delta H_{CH_4})][/tex]
where,
n = number of moles
Now put all the given values in this expression, we get
[tex]\Delta H=[(1\times -394)+(2\times -242]-[(2\times 0)+(1\times -75)][/tex]
[tex]\Delta H=-803kJ[/tex]
Therefore, the enthalpy change for combustion of methane is, -803 kJ
Related Questions
Pls help me with this question
Answers
Answer: b
Explanation: 50% comes from one parent and 50% comes from the other
Electromagnetic waves consist of
A. Compressions and rarefactions
B. High-frequency gravitational waves
C. Particles of light energy
D. Vibrating electric and magnetic fields
Answers
where is lithium and Flourine found on the periodic table?? :)
Answers
Answer:
Hello! Lithium is a Alkali metal, and is located on the left of the periodic table, right below Hydrogen (H), and right above Sodium (NA) .
Fluorine is located on the right of the table, next to Oxygen (O) and Neon (NE), and right above Chlorine (Cl).
Hope this helps !! :)
Ground water, the largest source of fresh water, is stored in bodies of rock and or sediment
a. porosity
b. sediment
c. particles
d. aquifers
i dont even know what this means
Answers
Hope this helps chief.
Draw the Lewis structure for AB4
Answers
the law of conversation of mass states that the mass of the reactant is ___ the mass of products
Answers
Answer: equal to
Explanation:
Zora wants to dissolve a solute in a solvent quickly. Which best describes what she should do?
decrease the pressure
decrease the surface area
shake it repeatedly
place in a refrigerator
Answers
Answer:
C shake it repeatedly
Explanation:
i think thats the answer if not sorry hope it helps you.
Answer:
C.
Explanation:
To go from grams to moles you will have to multiply the grams by 22.4 true or false
Answers
yes you do need to multiply it by 22.4
I In a smaller room, such as a bathroom, the reflected sound can reverberate (echo in many directions) off the smooth tile. Why do you think people enjoy singing in the shower?
Answers
Answer:
See explanation
Explanation:
It is common knowledge that quite a number of people enjoy singing in the shower. There are reasons for this!
In the shower, there are many surfaces that reflect the sound of your voice as you sing. That makes your voice to sound more powerful and have more volume.
The reverberation of the sound makes the sound of your voice stronger and more intense altogether enriching the music produced as you sing.
What happens to the moon every month? Science
Answers
Answer:
Every month Earth's moon goes through its phases, waning and waxing in its constant transformation from new moon to full moon and back again. This lunar cycle happens in part because the moon does not produce its own light; the silvery glow we see comes from sunlight reflecting off the moon's monochrome surface.
If 2.5 moles of H2O are needed to be produced, how much H2 will be needed?
Answers
Answer: Hope it can help you :)
Explanation:
All living things are made up of molecules that have carbon.
O True
O False
Answers
Answer:
True
Explanation:
Because Carbon is the primary component of macromolecules, including proteins, lipids, nucleic acids, and carbohydrates.
Answer:
True!
Explanation:
All living things contain carbon in some form. Carbon is the primary component of macromolecules, including proteins, lipids, nucleic acids, and carbohydrates. Carbon's molecular structure allows it to bond in many different ways and with many different elements. So therefore, its true (:
Someone please help me with these anything is helpful thanks
Answers
Explanation:
1 sulfur dioxide 2 monosulfur dinitride 10 nitrogen dioxide
Calculate the formula mass (Mr) of the compound iron (III) oxide, Fe2O3.
(show working)
Answers
Answer:
100
Explanation:
Fe = 26 (look on periodic table)
O = 16
(26×2) + (16×3) = 100
What is the answer, just the letter. No explanation needed
Answers
Answer:
Explanation:
f i did this in my class
Answer:
3 rd
Explanation:
yes answer is 3 you can go with it
How would an apple, potato, and onion all taste the same?
A) plugging your nose
B) Chewing on mint gum in intervals
C) eating them at the same time
Answers
Answer:
a
Explanation:
Answer:
a
Explanation:
How does weathering, erosion and deposition shape the Earth and contribute to the rock cycle
Answers
Answer:
it think like it kicks all the stuff away from the ground stuff, thats the best i can do sorry., im not a science person.
Explanation:
Bones function as levers for the muscle to provide movement of the body. What refers to increasing the angle of the joint, thus moving two bones farther apart?
A) Abduction
B) Adduction
C) extension
D) flexion
Answers
Answer:
It would be B
Explanation:
How does environmental changes affect animals?
Answers
Environmental changes affect animals depending on their ability to adapt to new conditions.
What is adaptation?An adaptation is any type of phenotypic feature associated with a higher fitness in a particular environment.
Adaptations are features that allow organisms to adapt to challenging environmental conditions.
In conclusion, environmental changes affect animals depending on their ability to adapt to new conditions.
Learn more about animal adaptations here:
https://brainly.com/question/29594
#SPJ1
tot Which of the following is not a property of water?
O A. ability to moderate temperatures
O B. ability to adhere to other substances
O c. ability to contract upon freezing
O D. ability to dissolve a wide variety of substances
Answers
How do the different processes of a rock cycle change a rock? Which processes will form an igneous, sedimentary, and metamorphic rock
Answers
Hope this helps (:
What are two ways that convection currents in the oceans distribute the Sun's energy? A. Icebergs are carried from the poles to the equator. B. Warm water is carried from the equator to the poles. C. Living things swim in cool and warm parts of the ocean. D. Nutrient-rich water is brought to the ocean surface
Answers
Answer:c
Explanation:
No cap
HELP !!!!!!!!!!!!! PLEEEAAAAASSSSSSEEEE
Answers
spring equinox: march 21-22
summer solstice: june 20-21
winter solstice: december 21-22
fall equinox: september 22-23
How many electron can be found in a p orbital?
Answers
Classify the following as elements, compounds and mixtures
Brass, Gold, rainwater, Sodium chloride, distilled water, sugar solution,
copper, Sulphur dioxide, Aluminium oxide, muddy water
Plz i need fast ASAP
Answers
Answer:
Elements
Gold, copper
Compounds
Sodium chloride, Sulphur dioxide, Aluminium oxide,
Mixture
Brass, rainwater, distilled water, sugar solution,muddy water
Explanation:
How does a material get a positive charge?
Answers
Answer:
positive charge comes from having more protons than electrons; negative charge comes from having more electrons than protons charge is quantized, meaning that charge comes in integer multiples of the elementary charge e
Explanation:
Part 1)
One reaction that produces hydrogen gas can be represented by the unbalanced chemical equation- Mg(s) + HCl(aq) −→ MgCl2(aq) + H2(g).
What mass of HCl is consumed by the reaction of 3.15 mol of magnesium?
Answer in units of g.
Part 2) What mass of MgCl2 is produced? Answer in units of g.
Part 3) What mass of H2 is produced? Answer in units of g.
Answers
Answer:
Part 1: 229.95g
Part 2: 598.5g
Part 3: 12.6g
Explanation:
Note: I learned this last week. Answer not sure.
Pls tell me if i got it right or wrong.
Mg + HCl - > MgCl2 + H2
First, balance the equation.
There is only 1 H and 1 Cl at the left side. BUT there are 2 Cl and 2 H at the right side. So you can add a 2 in front of HCl to balance it.
Mg + 2HCl - > MgCl2 + H2
Formula 1: (n= m/mr)
n = moles, m= mass, mr = molecular mass
Formula 2: (n= v/24)
v = volume
Part 1
What mass of HCl is consumed by the reaction of 3.15 mol of magnesium?
Ratio of
(look at the number in front of each)
2HCl : Mg
2 : 1
(3.15 x 2) : 3.15 moles
6.3 moles : 3.15 moles
So 2HCl has 6. 3 moles
Now use formula 1 (n = m/mr)
Calculate molecular mass of HCl
Check your periodic table
mr of HCl =(1 + 35.5) = 36.5
6.3 = m/36.5
m = 229. 95grams
Part 2
What mass of MgCl2 is produced? Answer in units of g.
Ratio of
2HCl : MgCl2
(1 +35.5) : (24+35.5x2)
36.5: 95
229.95g :?
229.95g : 598.5g
m = 598.5g
Part 3
What mass of H2 is produced? Answer in units of g.
2HCl : H2
36.5 : 2
229.95g :?
229.95g : 12.6g
m = 12.6g
List four factors that affect precipitation
Topic scowmce
Answers
Precipitation.
Humidity is the amount of water vapour in the air. This is produced by the evaporation
of water from oceans, lakes, rivers, wetlands and plants.
When water evapour in the air cools, it condenses. In other words, it becomes liquid and
forms little drops. These droplets form clouds.
When the droplets are small, they remain suspended in the atmosphere. But they often
become colder and their size and weight increases When they become too heavy to
remain suspended in the air, they fall to the Earth’s surface. We call this precipitation,
which may be rain, snow or hail.
Factors affecting precipitation.
Different areas of the Earth’s surface receive different amounts of precipitation.
Latitude: it rain more in the areas near the equator than in the temperature
zones and polar regions. The temperature is higher near the Equator so there is
more evaporation.
Altitude: it rains more in high areas than in low areas.
Level of humidity: it rains more on the coast than inland. Seas are a source of
humidity.
Precipitation is measured in millimeters (mm) per square matre.
What is the mass of 5.50 mol of iron
Answers
Answer:
306g
Explanation:
[tex]m=5.5*56=308g[/tex]
Answer:
307.45
Explanation:
atomic mass of iron is 55.9 grams
mass = atomic mass × number of moles
= 5.5 × 55.9
= 307.45
The volume of a gas is 200mL at 2.0atm. What will it's volume be at 4.0atm?
Answers
Answer:
V = 100 ml
Explanation:
P1V1 = P2V2
P1 = 2.0 atm
V1 = 200ml
P2 = 4.0 atm
V2 = ?
(2.0)(200) = (4.0)V2
400 = (4.0)V2
V2 = 100
The new pressure will be
1000 L
, rounded to one significant figure.
Explanation:
Boyle's law states that when a gas is held at a constant temperature and mass in a closed container, the volume and pressure vary inversely. The equation to use is
P
1
V
1
=
P
2
V
2
.
Given
V
1
=
200
mL
×
1
L
1000
mL
=
0.2 L
P
1
=
700 mmHg
V
2
=
100
mL
×
1
L
1000
mL
=
0.1 L
Unknown
P
2
Equation
P
1
V
1
=
P
2
V
2
Solution
Rearrange the equation to isolate
P
2
and solve.
P
2
=
P
1
V
1
V
2
P
2
=
(
700
mmHg
×
0.2
L
)
0.1
L
=
1400 L
, which must be rounded to
1000 L
because all of the measurements have only one significant figure