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allochka39001 [22]
2 years ago
9

Marjorie is trying to determine the identity of an unknown substance. After running tests, she determines that the substance is

insoluble in CCl4 with a density of about 2.2 g/mL.
Substance Density Boiling Point Solubility (in water) Solubility (in CCl4)
NaCl 2.165 g/mL 1413°C soluble insoluble
C10H8 1.14 g/mL 255°C insoluble soluble
FeCl3 2.898 g/mL 315°C soluble insoluble
SiO2 2.634 g/mL 2590°C insoluble insoluble


Using the data above, which of the following substances is most likely Marjorie's unknown?
A.
C10H8
B.
NaCl
C.
SiO2
D.
FeCl3
Chemistry
1 answer:
yan [13]2 years ago
7 0
The answer is going to be B . NaCl
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The mass of an iron(II) sulfate crystal is 8.36 g.How many moles of FeSO4 are in the crystal?
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The number of moles present in the FeSO4 are 0.055 mol.

<u>Explanation:</u>

  • The mass of a substance containing the same number  atoms in 12.0 g of 12C is known as mole. One mole of any substance is equal to  6.023 x 10^23. The moles of a substance can be determined by using the formula,

                 Number of moles = mass in grams / molecular mass

Given,

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         number of moles = 8.36 / 151.908

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