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kirill [66]
3 years ago
10

A) 5 days b) 8 days c) 9 days. i’m thinking maybe c d) 11 days

Chemistry
2 answers:
Delvig [45]3 years ago
4 0
I think A i’m not sure
DiKsa [7]3 years ago
3 0

The answer is b) eight days.

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More particles collide in the correct orientation​
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Which of the following correctly represents the radioactive decay of cesium-137?
Lelu [443]
The decay mode of cesium-137 is beta decay. This means that the cesium-137 decays into a beta particle and a nuclide with the same mass number, but with a charge number that is 1 more than that of cesium.

Therefore, this means Cs-137 decays into an electron and Barium-137, meaning the answer is choice 1.
6 0
2 years ago
In an exothermic reaction, an increase in temperature favors the formation of products.
pentagon [3]
False, in an exothermic reaction, an increase in temperature does not favor the formation of products. Instead, it favors the backward reaction. An exothermic reaction is a reaction where energy is transferred from the system out to the environment.
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4 years ago
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The value of AH° for the reaction below is +128.1 kJ CH3OH (I)-CO (g) + 2H2 (g) How much heat is consumed when 87.1 g of hydroge
natka813 [3]

Answer:

A) 2.76 x 103 kJ

Explanation:

CH3OH (I)--------->CO (g) + 2H2 (g)

Number of moles contained in 87.1g of hydrogen gas= mass of hydrogen gas/ molar mass of hydrogen gas

Molar mass of hydrogen gas= 2gmol-1

Number of moles hydrogen gas = 87.1g/2gmol-1= 43.55 moles of hydrogen

1 mole of methanol yields 2 moles of hydrogen

x moles of methanol yields 43.55 moles of hydrogen

x= 43.55 moles of hydrogen × 1 mole of methanol/2 moles of hydrogen

x= 21.775 moles of methanol

Then;

If 1 mole of methanol absorbs 128KJ of energy

21.775 moles of methanol will absorb 21.775 × 128/1 = 2.7×10^3 KJ of heat

6 0
3 years ago
2. An exothermic reaction releases 86.5 kJ. How many kilocalories of<br> energy are released?
Alenkasestr [34]

Answer:

20.67 kcal of energy is released.

Explanation:

It is given that, an exothermic reaction releases 86.5 kJ. We need to convet kJ to calories.  

Since,

1 kcal = 4.184  kJ

So,

1 kJ = 0.239  kcal

For 86.5 kJ,

86.5 kJ = (0.239 × 86.5) kcal

86.5 kJ = 20.67 kcal

So, 20.67 kcal of energy is released.

7 0
3 years ago
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