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3 years ago

Nitrogen gas effuses through an opening 1.59 times faster than an unknown gas.

1 answer:

5 0

A) Nitrogen has an ATOMIC mass number of 14, but nitrogen gas consists of N₂ molecules, so the mass to use in this problem is 28 g/mol. Rates of effusion ∝ 1/√(mass), so

√(mass unknown) /√28 = (rate N₂ effusion)/(rate unknown effusion) = 1.59 
∴ mass unknown = (1.59)²(28) = 70.78 g/mol 

B) One possible gas that comes close for this mass is NF₃.

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Question 9

Evgesh-ka [11]

Answer:

0.382 atm

Explanation:

In order to find the pressure, you need to know the moles of carbon dioxide (CO₂) gas. This can be found by multiplying the mass (g) by the molar mass (g/mol) of CO₂. It is important to arrange the conversion in a way that allows for the cancellation of units.

Molar Mass (CO₂): 12.011 g/mol + 2(15.998 g/mol)

Molar Mass (CO₂): 44.007 g/mol

15 grams CO₂ 1 mole
---------------------- x ------------------------ = 0.341 moles CO₂
44.007 grams

To find the pressure, you need to use the Ideal Gas Law equation.

PV = nRT

In this equation,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas Constant (0.08206 atm*L/mol*K)

-----> T = temperature (K)

After you convert Celsius to Kelvin, you can plug the given and calculated values into the equation and simplify to find the pressure.

P = ? atm R = 0.08206 atm*L/mol*K

V = 20 L T = 0 °C + 273.15 = 273.15 K

n = 0.341 moles

PV = nRT

P(20 L) = (0.341 moles)(0.08206 atm*L/mol*K)(273.15 K)

P(20 L) = 7.64016

P = 0.382 atm

7 0

2 years ago

Conservation of mass was discussed in the background. Describe how conservation of mass (actual, not theoretical) could be check

Sedbober [7]

Answer:

Conservation of mass can be checked in an experiment . There are three steps to do it in a best way:

1. Weigh all the equipment and materials required in the experiment before the experiment.

2. Avoid spillage and evaporation during the experiment.

3. Weigh all the equipment and materials after the experiment.

If the mass is conserved then weight from step 1 is equal to weight from step

3 0

3 years ago

What happens at night?

Alex

Warm air other the ocean moves onshore I think

7 0

3 years ago

Olin [163]

1. C. Linus Pauling

2. C. chemistry

3. A. atom

4. D. protons, neutrons and electrons

5. B. positively

6. A. negatively

7. C. uncharged

8. D. carries a charge

9. C. Au

10. D. protons in the nucleus

11. A. atoms

12. B. the pull of gravity on matter

13. C. protons

14. C. 112

15. C. symbols

16. D. compounds

17. C. sodium chloride salt

18. C. solids, liquids, and gases

19. A. the gaseous state

20. C. a number and a unit

21. B. the weight of an object

22. D. 1,000

23. C. 100

24. B. uncertain

25. D. 4

26. A. 1

27.C. 2.26 x 102

28. C. 5 x 10-3

29. C. atomic number

30. A. 5 g/cm3

31. D. temperature

32. C. meter

33. B. 2.2

3 0

3 years ago

To calculate the density of a sample of matter,you must divide it_____ by its______.

Ymorist [56]

I think it is voulume and total mass

8 0

3 years ago