A sample of gas contains 0.1200 mol of OF2(g) and 0.1200 mol of H2O(g) and occup

Chemistry
Tutor: None Selected Time limit: 1 Day

A sample of gas contains 0.1200 mol of OF2(g) and 0.1200 mol of H2O(g) and occupies a volume of 7.92 L. The following reaction takes place:


OF2(g) + H2O(g)O2(g) + 2HF(g)

Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.

 L
May 29th, 2015

Before we have n1=0,12+0,12=0,24 mol of gas, After the reaction takes place we have n2=0,12+2*0,12=0,36 mol of gas. Let's call V1 the volume before and V2 the volume after

PV1=n1RT (Ideal Gas Law)

PV2=n2RT 

V2/V1=N2/N1

so V2=V1*N2/N1=11,88 L

May 29th, 2015

Correct!! can u do this one for me i don't have time to post! 

Compute the root-mean-square speed of H2 molecules in a sample of hydrogengas at a temperature of 74°C.

     m s-1

May 29th, 2015

v=sqrt(3RT/M)

R=8,314

T=347 K

M=2

v=65,8 m/s

May 29th, 2015

that one wasn't right

May 29th, 2015

What value do you have ? 

May 29th, 2015

i put 65.8

May 29th, 2015

the error is from the fact that I have put 2 for M 

I should put M=0,002 kg/mol (SI units)

so the right answer is 2080 m/s

May 29th, 2015

At the first sight, the first answer seems too low for me. This one is more realistic. 

May 29th, 2015

Right! one more please ! im in a hurry 

Compute the root-mean-square speed of Ar molecules in a sample of argon gas at a temperature of 174°C.

     m s-1

May 29th, 2015

528

May 29th, 2015

1.32 mol sample of oxygen gas at a temperature of 9.00 °C is found to occupy a volume of 28.1 liters. The pressure of this gas sample is  mm Hg.

May 29th, 2015

A sample of nitrogen gas collected at a pressure of 663 mm Hg and a temperature of 279 K has a mass of 15.5 grams. The volume of the sample is  L.

May 29th, 2015

A sample of nitrogen gas collected at a pressure of 663 mm Hg and a temperature of 279 K has a mass of 15.5 grams. The volume of the sample is  L.

May 29th, 2015

826 mmHg and

29 L

May 29th, 2015

Match the gas sample on the left with a description on the right. 
You may use the same answer more than once.

0.299 moles of He in a5.18 L container at a temperature of 430K

0.703 moles of He in a6.93 L container at a temperature of 342K

0.331 moles of He in a4.33 L container at a temperature of 369K

0.732 moles of He in a1.52 L container at a temperature of 430K

has the highest average molecular speed

has the lowest average molecular speed

has an average molecular speed between the highest and the lowest


May 29th, 2015

Arrange the following molecules in order of increasing average molecular speed. All are at the same temperature.

argonheliumsulfur dioxideoxygen

Enter formulas in the boxes below: 1 = slowest, 4 = fastest

1234



May 29th, 2015

The average molecular speed in a sample of Kr gas is 306 m/s at 370 K. The average molecular speed in a sample of Ar gas is  m/s at the same temperature.

May 29th, 2015

The rate of effusion of Kr gas through a porous barrier is observed to be 2.30E-4 mol / h. Under the same conditions, the rate of effusion of Xe gas would be  mol / h.

May 29th, 2015

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