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riadik2000 [5.3K]
3 years ago
5

What is the percent composition of potassium in KNO3

Chemistry
2 answers:
ladessa [460]3 years ago
8 0

Answer:

38.6%

Explanation:

Molar mass of KNO3 is

=39+14+(16*3)

=53+48

=101 g/mol

Now

Percentage composition of potassium in KNO3 is=(atomic mass of K*no. of atoms)/molar mass of KNO3 *100%

%age composition of K= (39*1)/101 *100%

=0.386*100%

=38.6%

crimeas [40]3 years ago
7 0

Element     Symbol      Mass Percent

Nitrogen          N                   13.854%

Oxygen          O                   47.474%

Potassium        K                   38.672%

Please correct me if im wrong, If you find this helpful please mark me as brainliest!

Hope you have a beatiful day!

sincerley

~Angoraspinner (AKA jack)

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The temperature of a sample of water changes from 10°C to 20°C when the water absorbs 100 calories of heat. What is the mass of
Vlad1618 [11]

Answer:

10 g

Explanation:

Right from the start, just by inspecting the values given, you can say that the answer will be  

10 g

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Now, here's what that is the case.

As you know, a substance's specific heat tells you how much heat is needed to increase the temperature of  

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∘

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Water has a specific heat of approximately  

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, you need to provide  

4.18 J

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Now, how much heat would be required to increase the temperature of  

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10

∘

C

?

Well, you'd need  

4.18 J

to increase it by  

1

∘

C

, another  

4.18 J

to increase it by another  

1

∘

C

, and so on. This means that you'd need

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×

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=

41.8 J

to increase the temperature of  

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of water by  

10

∘

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.

Now look at the value given to you. If you need  

41.8 J

to increase the temperature of  

1 g

of water by  

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∘

C

, what mass of water would require  

10

times as much heat to increase its temperature by  

10

∘

C

?

1 g

×

10

=

10 g

And that's your answer.

Mathematically, you can calculate this by using the equation

q

=

m

⋅

c

⋅

Δ

T

 

, where

q

- heat absorbed/lost

m

- the mass of the sample

c

- the specific heat of the substance

Δ

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- the change in temperature, defined as final temperature minus initial temperature

Plug in your values to get

418

J

=

m

⋅

4.18

J

g

∘

C

⋅

(

20

−

10

)

∘

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m

=

418

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3 years ago
CORO<br> Name three ways that scientists can ensure their results<br> are reliable
Leya [2.2K]

Answer:

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Explanation:

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IgorC [24]

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This reaction is exothermic (energy is released).

6 0
3 years ago
Read 2 more answers
Please help I will reward brainly to the correct answers
hjlf
The second one!!!!!!!!!
3 0
3 years ago
Read 2 more answers
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