## iheartfood 2 years ago #1: In the reaction 2K + 2H2O---> 2KOH + H2, which compound has an element ratio of 1 : 1 : 1? A. K B. H2O C. KOH D. H2 **my answer; C is that right?? :/ @aaronq :)

1. aaronq

its right (Y) off to a good start!

2. iheartfood

#3: A substance has half the number of particles as 12 grams of carbon-12. How many moles are in the substance? A. 0.5 B. 1.0 C. 1.5 D. 2.0 **my answer; A is that right? :)

3. iheartfood

#4: Which of the following has 1.8 × 10^24 hydrogen atoms? A. 1 mole of water (H2O) B. 1 mole of peroxide (H2O2) C. 1 mole of ammonia (NH3) D. 1 mole of hydrogen gas (H2) **my answer; C is that right?

4. iheartfood

#5: What is the molar mass of magnesium sulfate heptahydrate (MgSO4 7H2O)? Be sure to include the mass of all elements in the formula including the elements in water. A. 246 g/mol B. 138 g/mol C. 120 g/mol D. 73 g/mol ** my answer: A is that correct?? :)

5. iheartfood

@aaronq :)

6. iheartfood

#6: You have 100 grams of rubidium bromide (RbBr). How many moles do you have? A. 0.61 mol B. 1.00 mol C. 1.22 mol D. 2.00 mol **my answer: A is that right? :)

7. iheartfood

#7: What volume will 0.75 moles of oxygen gas occupy at STP? A. 16.8 L B. 20.0 L C. 22.4 L D. 33.6 L **my answer: A is that right @aaronq ?? :)

8. iheartfood

#8: You have a 5-liter container with 1.30 × 10^24 molecules of ammonia gas (NH3). How many molecules of hydrogen gas (H2) are in an identical container at the same temperature and pressure? A. 6.02 × 10^23 molecules B. 2.00 × 10^23 molecules C. 6.02 × 10^24 molecules D. 1.30 × 10^24 molecules **my answer; D is that correct??? :)

9. iheartfood

#9: What mass will 33.6 L of oxygen gas (O2) have at STP? A. 16 g B. 32 g C. 34 g D. 48 g **my answer; D. 48 g is that right???

10. iheartfood

#10: You have one mole of a diatomic gas. Which of the following statements is true? A. You have one-third the number of particles that are in 12 grams of carbon-12. B. You have the same number of particles that are in 12 grams of carbon-12. C. You have three times the number of particles as in 12 grams of carbon-12. D. You have six times the number of particles that are in 12 grams of carbon-12. **my answer; B is that right??? :O

11. UnkleRhaukus

yeas you have one mole of particles, ( two moles of atoms )

12. iheartfood

wait, so 2-10 are correct?? :/

13. UnkleRhaukus

i have only checked #10 so far

14. iheartfood

and sorry!! here is #2, look like it got deleted :( #2: In which of the following reactions do five total molecules of reactants produce four total molecules of products? A. N2 + 3H2 ---> 2NH3 B. SnO2 + 2H2 ---> Sn + 2H2O C. 2H2S + 3O2 ---> 2SO2 + 2H2O D. 2SO2 + O2 --> 2SO3 my answer; A is that right??

15. iheartfood

oh oaky!! :)

16. UnkleRhaukus

#2 is not right option A N_2 + 3H_2 is only four particles of reactants #3 is right

17. iheartfood

ok :) so what is #2 then?? is it C? :)

18. UnkleRhaukus

yep

19. iheartfood

awesome! :) what about 4-9? :)

20. UnkleRhaukus

#4 is right

21. UnkleRhaukus

#5 is right

22. UnkleRhaukus

#6 is right

23. iheartfood

:) yayy!! what about 7-9? :)

24. aaronq

7 and 9 are good (Y)

25. iheartfood

okay! yay!! :) is 8 right too?

26. UnkleRhaukus

#7 is right

27. iheartfood

awesome!! :)

28. UnkleRhaukus

i think #8 is right too

29. iheartfood

okay great!! thanks!! :) @UnkleRhaukus can u pls give @aaronq a medal?? i can only give one :(

30. UnkleRhaukus

9# is right

31. aaronq

haha aw thanks guys, medals all around

32. UnkleRhaukus

great work

33. iheartfood

haha yeah :) and thanks!! thanks for all ur help!!! :D