What are the coinage elements ?

Chemistry

1 answer:

kupik [55]3 years ago

7 0

The elements of a coin.

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Equation for the reaction btn nitric acid and metal X whose valence is 3

viva [34]

(a) Reaction of nitric acid with non-metal:
C+4HNO
3

⟶CO
2

+2H
2

O+4NO
2

S+6HNO
3

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2

SO
4

+2H
2

O+6NO
2

(b) Nitric acid showing acidic character:
K
2

O+2HNO
3

⟶2KNO
3

+H
2

O
ZnO+2HNO
3

⟶Zn(NO
3

)
2

+H
2

O
(c) Nitric acid acting as oxidizing agent
P
4

+20HNO
3

⟶4H
3

PO
4

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2

O+20NO
2

3Zn+8HNO
3

⟶3Zn(NO
3

)
2

+4H
2

O+2NO

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3 0

2 years ago

The experiment above is repeated, but instead of extracting once with 6 mL the extraction is done three times with 2 mL of dichl

nevsk [136]

Complete Question

A student is extracting caffeine from water with dichloromethane. The K value is 4.6. If the student starts with a total of 40 mg of caffeine in 2 mL of water and extracts once with 6 mL of dichloromethane

The experiment above is repeated, but instead of extracting once with 6 mL the extraction is done three times with 2 mL of dichloromethane each time. How much caffeine will be in each dichloromethane extract?

Answer:

The mass of caffeine extracted is $P = 39.8 \ mg$