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Y_Kistochka [10]
3 years ago
6

What determines which element an atom is?

Chemistry
2 answers:
Lana71 [14]3 years ago
4 0
C) number of protons.
olga_2 [115]3 years ago
3 0
Hey there!

<span>What determines which element an atom is?

Answer: </span>
<span>C)number of protons

Hope this helps:)
</span>
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Hello, <br><br> So I was wondering if this is correct... Is it?
Sonja [21]
Looks correct but the second to last I would of put abiotic and biotic factors but I don’t know what’s right for you
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3 years ago
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It takes 167 s for an unknown gas to effuse through a porous wall and 99 s for the same volume of n2 gas to effuse at the same t
irakobra [83]

Answer : The molar mass of the unknown gas will be 79.7 g/mol


Explanation : To solve this question we can use graham's law;


Now we can use nitrogen as the gas number 2, which travels faster than gas 1;

So, 167 / 99 = 1.687 So the nitrogen gas is 1.687 times faster that the unknown gas 1

We can compare the rates of both the gases;


So here, Rate of gas 2 / Rate of gas 1 = \sqrt{(molar mass 1 / molar mass 2)}

Now, 1.687 = square root [\sqrt{(molar mass 1) / (28.01 g/mol N_{2})} ]


When we square both the sides we get;


2.845 = (molar mass 1) / (28.01 g/mol N2)


On rearranging, we get,


2.845 X (28.01 g/mol N2) = Molar mass 1

So the molar mass of unknown gas will be = 79.7 g/mol

3 0
3 years ago
A sample of 250 g of water are heated from 40°C to 121°C, calculate the amount of heat energy absorbed.
Marysya12 [62]

Answer:

the anwser isn't in the choices

Explanation:

H=MC(change of temp.)

M=mass of water=250g

C=specific heat of water = 4.186 j/g

change in temperature is 121-40= 81

H= 250x4.186x81=84766.5J

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Which consequence of new fishing methods had the most immediate impact on the environment?
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