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3 years ago

Convert 4.02 X 1023 atoms Fe to moles

1 answer:

6 0

0.668 moles!

1 mole of Fe weighs 55.845 g.
1 mole has 6.02*10^23 atoms.

(4.02*10^23)/(6.02/10^23) = 4.02/6.02=2.01/3.01=0.668 moles

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If the number of moles of gas is doubled at constant temperature and volume, the pressure of the gas:__________

Vladimir79 [104]

Answer:

answer is b

use pv=nRT

p directly proportional to moles(n)

p1/p2=n1/n2

p/p2=n/2n

p2=2p

4 0

4 years ago

Need help please ASAP

Mashutka [201]

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4 years ago

Which of the following formulas represents an empirical formula?

luda_lava [24]

Answer:

C is the only option that represents an empirical formula, as it can't be simplified further.

You can turn C8H18, for example: to C4H9, but you can't do the same with C2H5.

Let me know if this helps!

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3 years ago

Determine the empirical formula of kevlar, used in making bullet proof vests, is 70.6% c, 4.2% h, 11.8% n and 13.4% o.

Likurg_2 [28]

Assuming a basis of 100 g of Kevlar, therefore the masses are:

C = 70.6 g

H = 4.2 g

N = 11.8 g

O = 13.4 g

We know the molar masses are:

C = 12.01, H = 1.008, N = 14.01, O = 16.00

Calculating for the moles per element:

C = 70.6 / 12.01 = 5.88 mol

H = 4.2 / 1.008 = 4.17 mol

N = 11.8 / 14.01 = 0.84 mol

O = 13.4 / 16 = 0.84 mol

To get the empirical formula, the next step is to divide everything by the smallest moles = 0.84. So:

C = 7

H = 5

N = 1

O = 1

Hence the empirical formula is:

C7H5NO

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4 years ago

8. A foot describes what characteristic of measurement?

n200080 [17]

Answer:

It describes length of measurement...

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3 years ago