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PIT_PIT [208]
3 years ago
15

Help please I need it!

Chemistry
1 answer:
NeTakaya3 years ago
5 0
I think it’s V snowing
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The reaction energy of a reaction is the amount of energy released by the reaction. It is found by determining the difference in
MArishka [77]

correct answer is 7.8026035971 x 10^(-13) jo

Use Energy Conservation. By ``alpha decay converts'', we mean that the parent particle turns into an alpha particle and daughter particles. Adding the mass of the alpha and daughter radon, we get

m = 4.00260 u + 222.01757 u = 226.02017 u .

The parent had a mass of 226.02540 u, so clearly some mass has gone somewhere. The amount of the missing mass is

Delta m = 226.02540 u - 226.02017 u = 0.00523 u ,

which is equivalent to an energy change of

Delta E = (0.00523 u)×(931.5 Me V/1u)

Delta E = 4.87 Me V

Converting  4.87 Me V to Joules

1 joule [J] = 6241506363094 mega-electrón voltio [Me V]

4 mega-electrón voltio = 6.40870932 x 10^(-13) joule

4.87 mega-electrón voltio = 7.8026035971 x 10^(-13) joule

What is energy conservation?

Energy conservation is the decision and practice of using less energy. Turning off the light when you leave the room, unplugging appliances when they're not in use and walking instead of driving are all examples of energy conservation.

Why is energy conservation important?

When you limit your energy usage, you lower your impact on the environment. The longer we go without making significant changes, the greater the threat of global warming and climate change become to our daily lives. When we burn fossil fuels, they create an incredible amount of greenhouse gas emissions.

Learn more about energy conservation:

brainly.com/question/12306849

#SPJ4

8 0
1 year ago
Explain the following observation: Wet clothing spread out on a clothes line dries more quickly than wet clothing left in a pile
VashaNatasha [74]

The reason wet clothes spread out dry faster than when left in a pile is because there is more surface area therefore the rate of evaporation increases and this decreases the time it takes for the water molecules to diffuse into the air.

3 0
4 years ago
The half life of thallium 201 is 21.5 hours. We have 98 g of thallium 201 how many grams will be left after 10 half-lives?
Lynna [10]

Answer:

                     0.0957 g

Explanation:

                    Half life is the time required by the substance to decay to half of its initial mass. Most often exponential decays of radioactive substances are explained by half life. Half life remains constant throughout the life of decay.

It is given as;

<em>                                       N</em>(t)  =  N₀ (1/2)^t/t1/2

                                     

Where;

           <em>N</em>(t)  =  Amount remaining after certain time

           N₀  =  The starting initial amount

           t1/2  =  Half life of given substance

Putting values,

<em>                                       N</em>(t)  = 98 × (1/2)^215/21.5

<em>                                       N</em>(t)  = 0.0957 g

8 0
3 years ago
Question 1 of 10
storchak [24]

Answer:

B. Convert mass percents to moles and then divide by the smallest mole value to get subscripts

Explanation:

The empirical formula is the smallest whole number ratio the elements in a compound can possess. According to this question, to derive the empirical formula of a compound from its percent composition of elements that make it up, the following steps are followed:

- First, since the elements are in percentage, one would assume the total mass of the compound is 100g and take each percentage as the mass of each element. For example, if a compound contains 16% oxygen, it means that 16g of oxygen is present.

- Next, we convert the mass of each element to moles by dividing the mass value by the molar mass of each element. For example, 16g of oxygen will be 16g/16g/mol = 1mol

- Next, we divide each mole value by the smallest mole value to get the subscript of each element that will be used in the empirical formula.

8 0
3 years ago
Read 2 more answers
Using the periodic table, choose the more reactive nonmetal.<br> Te or O
jolli1 [7]

the answer is Te because O is oxygen.

5 0
3 years ago
Read 2 more answers
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