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Alborosie
3 years ago
5

An alloy is a mixture of metals. Suppose that a certain alloy is made by mixing 50 grams of an alloy that contains 52% copper wi

th 78 grams of pure copper.a). How many grams are in the resulting mixture? __grams.b). What percentage of the resulting mixture is copper? ___%
Chemistry
1 answer:
AleksandrR [38]3 years ago
4 0

Answer:

a) 128 grams

b) 81.25%

Explanation:

a) The mixture will be between the alloy and the pure copper, so the mass will be the sum of the mass of the compounds:

m = 50 + 78 = 128 g

b) In the alloy, 52% is copper, so to know the mass of copper in the alloy, we must multiply the total mass by 52% (which is 0.52)

0.52x50 = 26 g of copper

The total mass of copper in the mixture is 26 + 78 = 104 g

So, the percentual of copper is the mass of copper divided by the total mass

104/128 = 0.8125

Multiplying by 100%, to have the result in percentage

0.8125x100% = 81.25%

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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^{+}]}

So, clearly, higher the K_{a} value , lower will the the pK_{a}

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^{+}]})

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3 years ago
2) Convert 2.65*10^ ^ 25 atoms of Chlorine to moles of CI
Irina18 [472]

Answer:

22 mol

Explanation:

Given data:

Number of atoms of Cl = 2.65×10²⁵ atom

Number of moles of Cl = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

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0.44×10² mol

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3 years ago
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Percent error is the difference between the measured and known value, divided by the known value, multiplied by 100%.

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Finally, multiply your answer by 100

.0177777778 x 100= 1.77777778 %

Round to three significant figures, and you're done.

=1.78 % error



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