What is the energy change that will occur when 25.5 grams of oxygen gas (O2) react with excess methane (CH4) according to the reaction below? CH4 + 2 O2yields CO2 + 2 H2O delta H = -889 kJ/mol

Select one:
a. 354 kJ of energy will be given off by the reaction
b. 354 kJ of energy will be absorbed by the reaction
c. 708 kJ of energy will be given off by the reaction
d. 708 kJ of energy will be absorbed by the reaction

Answers

Answer 1

Answer: amount of CH4 is excess, so no need to worry about it
but the limiting factor is the Oxygen

according to stranded equation,

CH4 + 2 O2 --> CO2 + 2 H2O ΔH = -889 kJ/mol

just by taking proportions

(-889 kJ/mol) / 2 x 0.8 mol = - 355.6 kJ

so i think the answer is (a)

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What is a physical change

Answers

A change that one can see with the eye. Such as a new hairstyle or a growth over the years.

Hello there!

Explanation:

↓↓↓↓↓↓↓↓↓↓↓

Physical Change is a substance it does not change. Arrangement of molecules changes.

Solid
Liquid
Gas

Hope this helps!

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Which stage of grieving is actually a refusal to believe the event is occurring?A. denial
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Answers

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The action force always acts in the ____ direction as the reaction force

Answers

Answer:

opposite

Explanation:

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Which 1-mole sample has the least entropy?(1) Br2(s) at 266 K (3) Br2(l) at 332 K
(2) Br2(l) at 266 K (4) Br2(g) at 332 K

Answers

The correct answer is option 1. Entropy is the degree of disorderliness in a system. Among the phases, solid has the most ordered structure. Also, at lower temperatures the molecules will have less kinetic energy therefore less motion. Thus, bromine in solid form at 266K has the least entropy.

What are the half equations that exist in thus reaction: 4Na + O2 --->2Na2O .

Answers

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2Na + 2H2O mc012-1.jpg 2NaOH+H2, what mass of Na is required to yield 22.4 L of H2 at STP? (The atomic mass of Na is 22.99 u.)

Answers

46.0g Na

Since 22.4L of anything at STP is one mole, you can use your mole fraction to easily determine the # of moles of Na to produce one mole of H2. In this case, 2 moles of Na yield 1 mole H2, so all you need to do now is convert to grams. (Moles x Molar mass) which is 2 moles Na X 23g . this gives you the answer of 46g of Na.

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