## hannacanna Group Title I need help!!!! PLEASE! 43. If a gas has a volume of 1 L at a pressure of 270 kPa, what volume will it have when the pressure is increased to 540 kPa? Assume the temperature and number of particles are constant. (1 point) one year ago one year ago

1. itsmylife

use \[PV= n RT\]

2. hannacanna

I don't know how to use that. :(

3. itsmylife

or you can say \[\Delta P V=nRT\]

4. hannacanna

I don't even know what this is :/

5. itsmylife

alright holda

6. Hannalynn11

P1= 270kPa V1= 1L P2=540kPa V2=? use boyles law P1V1=P2V2 V2=P1 V1/P2 V2=270 * 1/ 540 V2= 0.5L that's the answer

7. hannacanna

thank you so much Hannah! Cause I had no idea how to do that! Can you help me with something else??

8. Hannalynn11

you're welcome.And sure!

9. itsmylife

\[P _{1}V _{1}=P_{2}V _{2}\] use this

10. hannacanna

Okay Hannah, I have this one How many grams of O2 are in 5.0 moles of the oxygen gas?

11. itsmylife

because number of moles, R and temperature is constant

12. hannacanna

Sodium reacts with chlorine gas to form sodium chloride. Write a balanced chemical equation for the reaction, and find the mass of chlorine gas that will react with 96.6 g of sodium. (3 points)

13. itsmylife

\[W=n* M=5*16=80g\] 80 gm of oxygen

14. hannacanna

Oh thanks!!!

15. Hannalynn11

For the first one, you need atomic mass of O2. Take the # of moles and multiply by atomic mass. Divide by 1mole for units to cancel. 2.00moles O2 * (32.0 grams)= 64.0 grams of O2. Im sure that's how to do it

16. itsmylife

oh wait, its 5 * 32 = 150 gms

17. itsmylife

its just number of moles* molar mass

18. hannacanna

Okay which one are we on again? I'm confused.

19. hannacanna

Are we talking about this one? Sodium reacts with chlorine gas to form sodium chloride. Write a balanced chemical equation for the reaction, and find the mass of chlorine gas that will react with 96.6 g of sodium. (3 points)

20. itsmylife

mine solution was to find weight of oxygen