Question

#1: At STP, how many molecules of nitrogen gas are in 22.4 L?

A. 6.022 × 10^22

B. 6.022 × 10^23

C. 6.022 × 10^24

D. 6.022 × 10^25

**my answer: B

is that right?? @aaronq :)

Answer 1

#2: Molar mass is the molecular (formula) mass of any substance expressed in which of the following?

A. moles

B. grams

C. kilograms

D. liters

**my answer: A

is that right?

Answer 2

molar mass is expressed in gram per mole

Answer 3

1 is right though

Answer 4

#3: Which of the following temperatures and pressures are used as standards for gases?

A. 0°C, 1 atm

B. 25°C, 1 atm

C. 10°C, 1 atm

D. 5°C, 2 atm

**my answer; A

or is it B?? ;/

idk im a bit conflicted :/

Answer 5

okay so what is #2 then? ;/

Answer 6

2 would be grams

Answer 7

mass = unit of weight measurement

Answer 8

ohhh okay!! :)

#4: Which of the following is NOT a measure of the amount of matter?

A. mole

B. molar mass

C. molar volume

D. STP

**my answer; D

is that right?

Answer 9

STP, standard temperature and pressure ALWAYS 25 celsius and 1 atm (760 torr/mm Hg)

Answer 10

4 is right

Answer 11

#5: Which of the following is equal to the number of particles in 18 grams of carbon-12?

A. 1.5 : 1 mole ratio

B. 1.5 : 1 molar mass

c. 1.5 moles

D. 1 : 1.5 molar volume

*my answer: B

is that right? :/

Answer 12

wait so #3 is B. 25°C, 1 atm ??

Answer 13

yeah 3 is B.
5 is oddly worded, the only that makes sense is 1.5 moles
because n=18g/12g/mol=1.5 moles

Answer 14

#6: Which of the following substances has a molar mass of 208 g?

A. P2O5

B. BaCl2

C. AlCl3

D. MgCl2

**my answer; B

is that right? :)

Answer 15

okay!! so #5 is what then?? :/

Answer 16

5 would be 1.5 moles, C.

Answer 17

6 is right (Y)

Answer 18

aweosme!! :) thx!

#7: Who discovered the principle that equal volumes of gases at the same temperature and pressure contain the same number of particles?

A. John Dalton

B. Amedeo Avogadro

C. Ernest Rutherford

D. Jacques Charles

*my answer: B

is that right? :)

Answer 19

yep! my main man avogadro

Answer 20

#8: What is the volume of 1.5 moles of gas at STP?

A. 9.02 L

B. 20.0 L

C. 33.6 L

D. 22.4 L

**my answer; C

is that right??

Answer 21

LOL thats hilarious!!! :P

Answer 22

#9: You do an experiment in which you need 0.25 moles of tyrosine (C9H11NO3). How many grams must you weigh out?

A. 45.3 g

B. 90.5 g

C. 181 g

d. 272 g

**my answer; A

is that right? :)

Answer 23

8 is good

Answer 24

9 is also correct

Answer 25

this one you might not get

Answer 26

#10: For an experiment, you need to dissolve 0.10 moles of NaCl in 1 liter of water. How much NaCl must you weigh out?

A. 8.2 g

B. 5.8 g

C. 3.2 g

D. 0.14 g

**my answer: B

to is it A?? :/

Answer 27

lol yeah i get it, cuz h202 is hydrogen peroxide, which is poisonous and would kill u haha my friend told me this b4 lol

Answer 28

hahaha wow, good stuff (Y)

Answer 29

#11: A doctor prescribes 1,500 mg of glucosamine (C6H13NO5) per day for a person with osteoarthritis. How many moles of glucosamine does the patient take each day?

A. 8.38

B. 8.38 × 10^-3

C. 0.12

D. 1.79 × 10^-3

**my answer: B

is that right?

haha and yeah ikr?? :) so is #10 right?? is it B? or is it A? :/

Answer 30

10 is right, B

Answer 31

#12: In a chemical reaction, you collect 500 mL of hydrogen gas at STP. How many moles of hydrogen gas did you collect?

A. 22

B. 0.22

C. 0.02

D. 0.004

**my answer; C

is that right??

and yayy :)

Answer 32

#13: How many atoms are in 1.0 moles of xenon gas at STP?

A. 2.2 × 10^23

B. 3.0 × 10^22

C. 3.0 × 10^24

D. 6.0 × 10^23

**idk this one :( do u get it?

Answer 33

11 is good!

Answer 34

yay :)

Answer 35

12 is good

Answer 36

#14: A chemical reaction produces oxygen gas. You collect 6.02 × 10^23 oxygen gas molecules at STP. What volume of oxygen gas did you collect?

A. 2.8 L

B. 5.6 L

C. 11.2 L

D. 22.4 L

**my answer; D
is that irhgt?? :)

Answer 37

for 13, you have to know that Xe(g) is not diatomic, so you know 1 mole = 6.022x10^23 atoms/molecules

Answer 38

14 is good also!

Answer 39

annnndd last one!!! (which unfortunately i do not understand :(.... )

#15: A chemical reaction produces 5.6 L of nitrous oxide gas (N2O) at STP. What is the mass of the gas produced?

A. 0.25 g

B. 5.6 g

C. 11 g

D. 44 g
***idk :(

Answer 40

so 13 would be D. 6.0 × 10^23 ??

Answer 41

lol that was a good one :P

and that kitty is so cute with the glasses and stuff!! =)

Answer 42

yes 13 is D, noble gases are ALWAYS unimolecular. uni=1

Answer 43

awesome! :)what about 15 tho??

and i found a good one hahaha :P i like this one :)

Answer 44

so for 15, find how many moles you produced,

1 mole of gas at STP = 22.414 L

so moles = 5.6/22.414

then use that to find the grams with the molar mass of N2O

moles= mass/molarmass

mass = moles*molarmass

Answer 45

HAHA I've never seen that one, i like it

Answer 46

so is #15 A. 0.25 g??

and i found a kinda continued one of one u posted above :)

and hahaa yeahh i like that one :)

Answer 47

lol

Answer 48

and this one :P

Answer 49

nope! 11 g

Answer 50

"ALL THESE CHEM JOKES ARE BORON ME" LOL

Answer 51

and i liked this one too :P

Answer 52

haha periodically

Answer 53

okay!! :) thanks!! :)

and lol that ones good :)

and heres another one.. but its with... the one and only!!! PAtrick... STar!!!!

Answer 54

oh wait i added up the molar mass of N2O wrong i did NO2

Answer 55

lol it's still 11 grams

Answer 56

okay!! haha thanks!! :D

Answer 57

:) no prob

haha i haven't watched spongebob in like i don't even know, forever.

Answer 58

haha yeah same, but i love patrick!! :) i mean he lives in a rock.. how do u even find a hollowed out rock?? :) spongebob is awesome!! :)the best cartoon ever!! :) lol thanks again!! :D

Answer 59

it is so awesome, i liked the movie too!

no problem at all!

Answer 60

yeah!! haha i watched it a while ago but all spongebob is good and funny :)

Answer 61

agreed :)

i'm gonna go, see ya !

Answer 62

byebye! :D