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yarga [219]
3 years ago
9

Easy Chemistry/ Help

Chemistry
1 answer:
Sauron [17]3 years ago
4 0
I’m not really sure what the qn is asking for but if i’m not wrong it should be ‘1’ for each blank!
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How many copper atoms are in a pure copper statue with a mass of 142kg
Ksenya-84 [330]
142 kg in grams:

1 kg ---------- 1000 g
142 kg -------- ?

142 x 1000 / 1 => 142000 g 

Atomic mass Cu =  63.54 a.m.u

Therefore:

63.54 g ------------ 6.02x10²³ atoms
142000 g --------- ??

142000 x ( 6.02x10²³) / 63.54 =

8.54.10²⁸ / 63.54 => 1.34.10²⁷ atoms of Cu



5 0
3 years ago
A sample of nitrogen gas has a volume of 237mL at 9.86atm. What is the new
MrRa [10]

Answer:

The new  volume of the gas when the pressure is changed to 2.84 atm is 822.82 mL.

Explanation:

Boyle's law says that "The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure." That is, if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or

P * V = k

Assuming that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment, by varying the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1*V1=  P2*V2

In this case:

  • P1= 9.86 atm
  • V1= 237 mL
  • P2= 2.84 atm
  • V2=?

Replacing:

9.86 atm* 237 mL= 2.84 atm*V2

and solving you get:

V2=\frac{9.86 atm* 237 mL}{2.84 atm}

V2= 822.82 mL

<u><em>The new  volume of the gas when the pressure is changed to 2.84 atm is 822.82 mL.</em></u>

3 0
3 years ago
What do you have to do to change an atom labeled + ion or - ion into a neutral atom?
avanturin [10]

Answer:

to change an atom labeled + ion or -ion into a neutral atom, an electron is either added or removed from it

8 0
3 years ago
What type of energy transformation happens during photosynthesis?
GaryK [48]

Answer:

radiant - chemical is the best answer

3 0
3 years ago
10 Given the balanced ionic equation representing a reaction:
Anon25 [30]

Answer:

Option (A) Each Zn atom loses 2 electrons, and each Co2+ ion gains 2

Explanation:

To know the right answer to the question, let us observe the changes in the oxidation number of Zn and Co. This is illustrated below:

Zn(s) + Co2+(aq) → Zn2+(aq) + Co(s)

The oxidation number of Zn changes from 0 to +2 indicating that Zn has lose 2 electrons.

The oxidation number of Co changes from +2 to 0 indicating that Co has gain 2 electrons.

Therefore, option A is the correct answer.

5 0
4 years ago
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