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RoseWind [281]
3 years ago
9

What is the mass of an atom that has 4 protons, 5 neutrons, and 4 electrons?

Chemistry
2 answers:
Mazyrski [523]3 years ago
3 0
The answer would be 9
WITCHER [35]3 years ago
3 0
To get the mass, you would add the <span> 4 protons and 5 neutrons so it would be 9. 
(The electrons weigh practically nothing so you just ignore them.)</span>
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Calculate the χacetone and χcyclohexane in the vapor above the solution. p°acetone = 229.5 torr and p°cyclohexane = 97.6 torr.
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First calculate the mole fraction of each substance:
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Cyclohexane: 1.45 ÷ (2.88 mol + 1.45 mol) = 0.335
Raoult's Law: P(total) = P(acetone) · χ(acetone)  + P(cyclohexane) · χ(cyclohexane).
P(total) = 229.5 torr · 0.665 + 97.6 torr · 0.335
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Iron and oxygen form rust. How many moles of rust should be produced if 1
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Answer:

1.387 moles

Explanation:

Step 1:

The balanced equation for the reaction. This is illustrated below:

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Step 2:

Determination of the number of mole of Fe in 155.321g of Fe. This can be achieved by doing the following:

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From the balanced equation above,

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Therefore, 1.387 moles of rust (Fe2O3) is produced from the reaction

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The animals have to adapt to their new environment meant and continue mating so they do not go extinct
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