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3 years ago

How do you do this? very confused

Chemistry

1 answer:

Vlad [161]3 years ago

4 0

The problem you have written you almost have it solved. Take the moles that you have calculated and multiply that by the molecular weight to get the grams.

The STP problem:
use the moles you calculated along with 1 atm for Pressure, and 273 for the temperature and plug into the PV = nRT equation. (also use 0.0821 for R)

From there you can solve for the volume

Hope this helps!

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Problem PageQuestion While ethanol is produced naturally by fermentation, e.g. in beer- and wine-making, industrially it is synt

OverLord2011 [107]

Question: The question is incomplete. Below is the complete question and the answer;

While ethanol (CH3CH2OH is produced naturally by fermentation, e.g. in beer- and wine-making, industrially it is synthesized by reacting ethylene CH2CH2) with water vapor at elevated temperatures. A chemical engineer studying this reaction fills a 50.0 L tank at 22. °C with 24. mol of ethylene gas and 24. mol of water vapor. He then raises the temperature considerably, and when the mixture has come to equilibrium determines that it contains 15.4 mol of ethylene gas and 15.4 mol of water vapor The engineer then adds another 12. mol of water, and allows the mixture to come to equilibrium again. Calculate the moles of ethanol after equilibrium is reached the second time. Round your answer to 2 significant digits.

Answer:

Number of moles of ethanol = 11 mol

Explanation:

SEE THE ATTACHED FILE FOR THE CALCULATION

4 0

3 years ago

Which type of bonds do polar covalent bonds break down in chemical reactions?

Vlada [557]

Answer:

(C) im pretty sure is the answer

Explanation:

3 0

3 years ago

A compound contains only nitrogen and oxygen and is 30.5% nitrogen by mass. A gaseous sample of the compound has a density of 3.

MariettaO [177]

Answer : The molecular formula of the compound will be, $NO_4$

Explanation:

First we have to calculate the mass of nitrogen and oxygen.

As we are given that 30.5 % nitrogen by mass that means 30.5 g of nitrogen present in 100 g of solution.

Mass of nitrogen = 30.5 g

Mass of oxygen = Mass of solution - Mass of nitrogen

Mass of oxygen = 100 g - 30.5 g

Mass of oxygen = 69.5 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of N = $\frac{\text{Given mass of N}}{\text{Molar mass of N}}=\frac{30.5g}{28g/mole}=1.09moles$

Moles of O = $\frac{\text{Given mass of O}}{\text{Molar mass of O}}=\frac{69.5g}{16g/mole}=4.34moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 1.09 moles.

For N = $\frac{1.09}{1.09}=1$

For O = $\frac{4.34}{1.09}=3.98\approx 4$

Step 3: Taking the mole ratio as their subscripts.

The ratio of N : O = 1 : 4

Hence, the empirical formula for the given compound is $NO_4$

The empirical mass of given compound is $NO_4$ = 1(28) + 4(16) = 92 g/eq

To calculate the molecular mass of compound we are using ideal gas equation:

$PV=nRT\\\\PV=\frac{w}{M}RT\\\\P=\frac{w}{V}\\times \frac{RT}{M}\\\\P=\rho \frac{RT}{M}$

where,

P = pressure of gas = 924 torr = 1.216 atm

Conversion used : (1 atm = 760 torr)

T = temperature of gas = $105^oC=273+105=378K$

R = gas constant = 0.0821 L.atm/mole.K

$\rho$ = density of gas = 3.61 g/L

M = molar mass of gas = ?

Now put all the given values in the ideal gas equation, we get:

$(1.216atm)=3.61g/L\times \frac{(0.0821L.atm/mole.K)\times (378K)}{M}$

$M=92.1g/mol$

Now we have to calculate the molecular formula of the compound.

The equation used to calculate the valency is :

$n=\frac{\text{molecular mass}}{\text{empirical mass}}$

$n=\frac{92.1}{92}=1$

Molecular formula = $(NO_4)_n=(NO_4)_1=NO_4$

Thus, the molecular formula of the compound will be, $NO_4$

4 0

3 years ago

How many grams would 3.98 x 10^24 atoms of oxygen weigh

Semenov [28]

Answer:

a little bit

Explanation:

i think

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3 years ago

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The presence of hydrogen bond in most molecules is responsible for the following except

-Dominant- [34]

That answer is either 3 or 4, but I truly forgot which of the two.

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3 years ago

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