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tekilochka [14]

4 years ago

15

Which of these pure substances has the highest vapor pressure at 1 atm? Note: Vapor Pressure is inversely related to IMF strengt

h,
O CH4
O NH3
PH3
SIH4

1 answer:

marin [14]4 years ago

4 0

Answer:

PH3

Explanation:

thats a rough guess i wasnt very good at chem

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Which formula contains a metal and a nonmetal? SO2 MgO CO H2O

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Answer:

MgO

Explanation:

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Cryolite (Na3AlF6) is used in the production of aluminum from its ores. It is made by the reaction 6 NaOH 1 Al2O3 1 12 HF 8n 2 N

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<u>Answer:</u> The mass of cryolite produced in the reaction is 1181.8 g

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of aluminium oxide = 287 g

Molar mass of aluminium oxide = 102 g/mol

Putting values in equation 1, we get:

$\text{Moles of aluminium oxide}=\frac{287g}{102g/mol}=2.814mol$

The given chemical reaction follows:

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By Stoichiometry of the reaction:

1 mole of aluminium oxide produces 2 moles of cryolite

So, 2.814 moles of aluminium oxide will produce = $\frac{2}{1}\times 2.814=5.628mol$ of cryolite

Now, calculating the mass of cryolite by using equation 1:

Moles of cryolite = 5.628 moles

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Putting values in equation 1, we get:

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