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xxTIMURxx [149]
2 years ago
6

How many copper atoms are in a pure copper statue with a mass of 142kg

Chemistry
1 answer:
Ksenya-84 [330]2 years ago
5 0
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



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Please help me and thank you
Alex17521 [72]

Answer:

The physical and chemical properties of the product do not match the properties of the reactant.

Explanation:

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg .

The reaction of Hydrogen and oxygen:

H 2 (g)  + O 2  (g) -------------------------------------> 2H 2O  (l)

The reaction between sugar and oxygen form a product which is different from the reactant that's why it indicate the occurrence of chemical reaction.

While in case of physical changes just state of matter are changed. Properties remain same.

6 0
2 years ago
Addition of 50. J to a 10.0-g sample of a metal will cause the temperature of a metal to rise from 25ºC to 35ºC. The specific he
Snowcat [4.5K]

Answer:

b) C = 0.50 J/(g°C)

Explanation:

  • Q = mCΔT

∴ Q = 50 J

∴ m = 10.0 g

∴ ΔT = 35 - 25 = 10 °C

specific heat (C) :

⇒ C = Q / mΔT

⇒ C = 50 J / (10.0 g)(10 °C)

⇒ C = 0.50 J/(g°C)

7 0
3 years ago
Help PLEASE HELP PLEASE
Gennadij [26K]

Answer:

b. k+

Explanation:

4 0
3 years ago
Is a oreo a pure substance or a mixture
adoni [48]
Belive it or not but an oreo is a mixture. LOL
7 0
2 years ago
CH3CO2H(aq) + H2O(l) ⇄ CH3CO2-(aq) + H3O+(l)
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Correct Answer: Option C:<span> The equilibrium position will shift to the right toward the products. 

Reason:
1) This problem is based on </span>Le Chatelier's principle. It is stated as '<em>any</em><span><em> changes in the temperature, volume, or concentration of a system will result in predictable and opposing changes in the system in order minimize this change and achieve a new equilibrium state.</em>' 

2) In present case, the reaction involved is: 
</span><span>                 CH3CO2H(aq) + H2O(l) ⇄ CH3CO2-(aq) + H3O+(l) 
</span>Hence, when the concentration of acetic acid (reactant) is increased, the equilibrium will shift to right to minimize the effect of change in concentration of reactant. 
4 0
2 years ago
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