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gavmur [86]
3 years ago
9

How many moles are there in 1.68 * 10 ^ 24 molecules of nitrogen dioxide?

Chemistry
1 answer:
padilas [110]3 years ago
3 0

Answer:

<h2>2.79 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{1.68 \times  {10}^{24} }{6.02 \times  {10}^{23} } \\  = 2.790697 ...

We have the final answer as

<h3>2.79 moles</h3>

Hope this helps you

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Answer:

Small-scale convection currents arise from uneven heating on a smaller scale. This kind of heating occurs along a coast and in the mountains. Small-scale convection currents cause local winds. Local winds blow over a much smaller area and change direction and speed over a shorter period of time than global winds.

Maybe that will help you answer the question.

6 0
3 years ago
How many total atoms in the compound Al3NO2
evablogger [386]

Answer:

1 mole of aluminum must contain 6.022⋅1023 atoms of aluminium → this is known as Avogadro's constant.

Explanation:

5 0
3 years ago
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1. How much heat (in calories) is needed to raise 20 g of H2O from 5°C to 40°C? (c = 1.0 cal/g °C)
KIM [24]

Answer:

700 calories

Explanation:

Using the formula below:

Q = m × c × ∆T

Where;

Q = amount of heat required (calories)

m = mass of substance (g)

c = specific heat of substance (cal/g°C)

∆T = change in temperature (°C)

According to this question, the following information was provided;

Q = ?

m = 20g

c = 1.0 cal/g °C

∆T = 40°C - 5°C = 35°C

Using the formula; Q = m × c × ∆T

Q = 20 × 1 × 35

Q = 700 calories

Hence, 700 cal of heat energy is needed to raise 20 g of H2O from 5°C to 40°C.

6 0
2 years ago
Which of the following is a chemical change?
FromTheMoon [43]

<u>Answer:</u>

<em>Silver tarnishing as the silver metal reacts with sulphur is a chemical change.</em>

<u>Explanation:</u>

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Similarly for soil drying also the concentration of water will be decreased leading to a physical change from wetty or dry soil.

But the last option which indicates tarnishing of silver metal on reaction with sulphur is a chemical process as the surface of silver metal will be reacting to sulphur and leads to lose of electrons which leads to corrosion of the surface or tarnishing of silver.

4 0
3 years ago
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Alisiya [41]

Answer:

Explanation:

Your answer should be in the attached pdf

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5 0
3 years ago
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