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Artemon [7]
3 years ago
5

How many protons does this atom have?:____

Chemistry
2 answers:
lorasvet [3.4K]3 years ago
7 0

QUESTION:-

How many protons does this atom have?:____

How many neutrons does this atom have?:____

How many electrons does this atom have?:____

ANSWER:-

CIRCLE WITH +VE CHARGE :- PROTONS = 6

CIRCLE WITH NO CHARGE:- NEUTRON = 8

CIRCLE WITH -VE CHARGE:- ELECTRONS = 6

Allisa [31]3 years ago
4 0

Answer:

1.6

2.8

3.6

Explanation:

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Answer:

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total time of decay = 15.2 days

initial amount = 100. g

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What can you infer about copper and silver based on the position related to each other on the periodic table
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The most common source of copper (cu) is the mineral chalcopyrite (cufes2). how many kilograms of chalcopyrite must be mined to
tigry1 [53]

Answer : 0.8663 Kg of chalcopyrite must be mined to obtained 300 g of pure Cu.

Solution : Given,

Mass of Cu = 300 g

Molar mass of Cu = 63.546 g/mole

Molar mass of CuFeS_2 = 183.511 g/mole

  • First we have to calculate the moles of Cu.

\text{ Moles of Cu}=\frac{\text{ Given mass of Cu}}{\text{ Molar mass of Cu}}= \frac{300g}{63.546g/mole}=4.7209moles

The moles of Cu = 4.7209 moles

From the given chemical formula, CuFeS_2 we conclude that the each mole of compound contain one mole of Cu.

So, The moles of Cu = Moles of CuFeS_2 = 4.4209 moles

  • Now we have to calculate the mass of CuFeS_2.

Mass of CuFeS_2 = Moles of CuFeS_2 × Molar mass of CuFeS_2 = 4.4209 moles × 183.511 g/mole = 866.337 g

Mass of CuFeS_2 = 866.337 g = 0.8663 Kg         (1 Kg = 1000 g)

Therefore, 0.8663 Kg of chalcopyrite must be mined to obtained 300 g of pure Cu.


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