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const2013 [10]
2 years ago
9

Enter the chemical equation 2h (aq) s2−(aq)→h2s(g).

Chemistry
1 answer:
horrorfan [7]2 years ago
5 0
I don't understand what is (g).
Maybe the answer is 2H<span>(aq)S</span>₂<span>−2(aq) </span>⇒ <span>H</span>₂<span>S</span>₂.
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How many total ions are present in 347g of cacl2?
vladimir1956 [14]

In 1 mole of CaCl_{2}, there are 3 moles of ions, 1 mole of Ca^{2+} and 2 mole of Cl^{-1}.

CaCl_{2}\rightarrow Ca^{2+}+2Cl^{-}

Molar mass of CaCl_{2} is 110.98 g/mol. Calculating number of moles from given mass as follows:

n=\frac{m}{M}=\frac{347 g}{110.98 g/mol}=3.12 mol

Thus, number of moles of ions will be 3\times 3.12 mol=9.38 mol.

Since, 1 mole of any substance has 6.023\times 10^{23} units of that substance where 6.023\times 10^{23}  is Avogadro's number.

Thus, 9.38 mol of ions will have 9.38\times 6.023\times 10^{23}=5.65\times 10^{24} number of ions.

Therefore, total number of ions in 347 g of CaCl_{2} is  5.65\times 10^{24}.


8 0
2 years ago
If the speed of a vehicle increases by 22%, by what factor does its kinetic energy increase?
Mila [183]

Answer:

The kinetic increases by 48.84 %

Explanation:

The expression for the kinetic energy is:-

K.E.=\frac{1}{2}\times mv^2

Where, m is the mass of the object

v is the velocity of the object

Let the new velocity is:- v'

v is increased by 22 %. Thus, v' = 1.22 v

So, the new kinetic energy is:-

K.E.'=\frac{1}{2}\times mv'^2=\frac{1}{2}\times m{1.22}^2=\frac{1}{2}\times mv^21.4884=1.4884K.E.

<u>Thus, the kinetic increases by 48.84 %</u>

7 0
2 years ago
Read 2 more answers
Determine ΔT if T1 = 45oC and T2 = 13oC
balandron [24]

Answer:

∇T = -32°C

Explanation:

T1 = 45°C

T2 = 13°C

∇T =?

∇T = change in temperature = final temperature - initial temperature

∇T = T2 - T1

∇T = 13 - 45

∇T = -32°C

The change in temperature is -32°C

6 0
2 years ago
What is the pH of a 0.75 M HNO3 solution
Sauron [17]
Hello!

The dissociation reaction of HNO₃ is the following:

HNO₃ → H⁺ + NO₃⁻

This is a strong acid, so the concentration of HNO₃ would be the same as the concentration of H⁺. The formula for pH is the following:

pH=-log([H_3O^{+}])=-log(0,75M)=0,12

So, the pH would be 0,12

Have a nice day!
4 0
2 years ago
Read 2 more answers
Miley partridge if you see this I am CJ and these hearts are for you ❤❤❤❤❤❤
Zanzabum

Answer: not to be rude but who is Miley partridge? If she is a friend then u r a kind hearted person

Explanation:

6 0
2 years ago
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