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laila [671]
3 years ago
14

What important discovery did Ernest Rutherford make?

Chemistry
2 answers:
EleoNora [17]3 years ago
7 0

Answer:

D if im pretty sure

Explanation:

In 1909 he began experiments that were to change the face of physics. He discovered the atomic nucleus and developed a model of the atom that was similar to the solar system.

luda_lava [24]3 years ago
3 0

Answer:

d

Explanation:

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i am unique and have a specific number in the periodic table

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in which part of the plant does photosynthesis take place A. the roots B. The leaves C. the flowers?​
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What is the width of this penny?
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Answer:

D. 1.2 cm

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3 years ago
The vapor pressure of pure pentane and pure hexane are 425 torr and 151 torr respectively. equal moles of pentane and hexane are
nadezda [96]

The mole fraction of pentane in the vapor is 0.291

Vapour pressure rises with temperature and is a measurement of a substance's propensity to transform into a gaseous or vapour state. The boiling point of a liquid is the temperature at which the pressure exerted by its surroundings equals the vapour pressure present at the liquid's surface.

The number of moles of a particular component in the solution divided by the overall number of moles in the sample solution is known as the mole fraction.

Using the formula for vapour pressure,

vapour pressure = P^{}°_{hex} × X_{hex} + P^{}°_{pen} × X_{pen}

vapour pressure = 151 ×  (1-X_{pen}) + 425 × X_{pen}

240 = 151 - 151X_{pen} + 425X_{pen}

240 - 151 = -  151X_{pen} + 425 X_{pen}

89 = 274 X_{pen}

\frac{89}{274} = X_{pen}

0.291 = X_{pen}

Therefore,  the mole fraction of pentane in the vapor is 0.291

Learn more about vapour pressure here;

brainly.com/question/25699778

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2 years ago
Melting is considered a(n) ___ change because energy is gained by the substance as it changes state
Burka [1]
Melting is a physical change
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