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4 years ago

What is the percent composition of CuCl2?

2 answers:

8 0

$CuCl_2$
There is 2 times more $Cl$ than $Cu$ .

So for 1 :
$Cu$ : $\frac{1}{3}$
$Cl$ : $\frac{2}{3}$

So percent composition :
$Cl$ ⇒ $66$ %
$Cu$ ⇒ $33$ %

allochka39001 [22]4 years ago

4 0

CuCl2 is Dichloride Copper, or Copper II Chloride.
In this Molecule, there is 1 atom of Copper for every 2 atoms of Chlorine.
If you go to the periodic table, you'll see that copper has a mass of 63.5 amu, and the chlorine 35.45 amu.
Which mean that the mass of CuCl2 is 63.5 + 35.45*2 = 63.5 + 70.9 = 134.4 g/mol.
Then, you find the ration of the mass of each atom and multiply by 100.
Ratio of Copper: $\frac{63.5}{134.4} * 100$ and you get about 47.2%
Ration of chlorice (Cl2): $\frac{70.9}{134.4} * 100$ and you get about 52.8%.

So, the percent composition of CuCl2 is 47.2% of Copper and 52.8% of chlorine.

Hope this Helps :)

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Answer:

$\frac{[F^{-}]}{[HF]}$ is larger

Explanation:

$pK_{a}=-logK_{a}$ , where $K_{a}$ is the acid dissociation constant.

For a monoprotic acid e.g. HA, $K_{a}=\frac{[H^{+}][A^{-}]}{[HA]}$ and $\frac{[A^{-}]}{[HA]}=\frac{K_{a}}{[H^{+}]}$

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In this mixture, at equilibrium, $[H^{+}]$ will be constant.

$K_{a}$ of HF is grater than $K_{a}$ of HCN

Hence, $(\frac{F^{-}}{[HF]}=\frac{K_{a}(HF)}{[H^{+}]})>(\frac{CN^{-}}{[HCN]}=\frac{K_{a}(HCN)}{[H^{+}]})$

So, $\frac{[F^{-}]}{[HF]}$ is larger

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3 years ago

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3 years ago

What is the volume of 2 mol of chlorine gas at STP? 2.0 L 11.2 L 22.4 L 44.8 L

nirvana33 [79]

Answer:

44.8 L

Explanation:

Using the ideal gas law equation:

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T = temperature (K)

At Standard temperature and pressure (STP);

P = 1 atm

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3 years ago

For the reaction CO+2H2=CH3OH at 700 K, equilibrium concentrations are [H2]=0.072 M, [CO]= 0.020M, and [CH3OH]= 0.030 M. Calcula

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The given concentrations are at equilibrium state. Hence we can use them directly in calculation with the expression for the equilibrium constant, k. expression for k can be written as

k = [CH₃OH(g)] / [CO(g)] [H₂(g) ]²

[H₂]=0.072 M
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From substitution,

k = 0.030 M / 0.020 M x (0.072 M)²

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3 years ago

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Answer:
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