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notsponge [240]
3 years ago
6

Please help How many moles are there in 7.57 x 10^30 molecules of CO2?

Chemistry
1 answer:
Oxana [17]3 years ago
3 0

Answer:

The answer is

<h2>12,574,750.83 moles</h2>

Explanation:

In order to find the moles of CO2 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

N = 7.57 × 10^30 molecules of CO2

We have

n =  \frac{7.57 \times  {10}^{30} }{6.02 \times  {10}^{23} }  \\  = 12574750.83056...

We have the final answer as

<h3>12,574,750.83 moles</h3>

Hope this helps you

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In an equimolar mixture of o2 and n2, are the mass fractions equal?
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Answer:

No

Explanation:

The mass fraction is defined as:

w_{i}=\frac{m_{i} }{m_{t} }

where:

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<u><em>The mass fraction of two substances (A and B), will be the same, ONLY if the mass of the substance A (mA) is the same as the mass of the substance B (mB).</em></u>

An equimolar mixutre of O2 and N2 has the same amount of moles of oxygen and nitrogen, just to give an example let's say that the system has 1 mole of O2 and 1 mole of N2. Then using the molecuar weigth of each of them we can calculate the mass:

mA= 1 mole of O2 * 16 g/1mol = 16 g

mB=1 mole of N2 *28 g/1mol=28 g

As mA≠mB then the mass fractions are not equal, so the answear is NO.

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