anonymous
  • anonymous
#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 :)
Chemistry
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
#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?
aaronq
  • aaronq
molar mass is expressed in gram per mole
aaronq
  • aaronq
1 is right though

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anonymous
  • anonymous
#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 :/
anonymous
  • anonymous
okay so what is #2 then? ;/
aaronq
  • aaronq
2 would be grams
aaronq
  • aaronq
mass = unit of weight measurement
anonymous
  • anonymous
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?
aaronq
  • aaronq
STP, standard temperature and pressure ALWAYS 25 celsius and 1 atm (760 torr/mm Hg)
aaronq
  • aaronq
4 is right
anonymous
  • anonymous
#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? :/
anonymous
  • anonymous
wait so #3 is B. 25°C, 1 atm ??
aaronq
  • aaronq
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
anonymous
  • anonymous
#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? :)
anonymous
  • anonymous
okay!! so #5 is what then?? :/
aaronq
  • aaronq
5 would be 1.5 moles, C.
aaronq
  • aaronq
6 is right (Y)
anonymous
  • anonymous
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? :)
aaronq
  • aaronq
yep! my main man avogadro
aaronq
  • aaronq
1 Attachment
anonymous
  • anonymous
#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??
anonymous
  • anonymous
LOL thats hilarious!!! :P
anonymous
  • anonymous
#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? :)
aaronq
  • aaronq
8 is good
aaronq
  • aaronq
9 is also correct
aaronq
  • aaronq
1 Attachment
aaronq
  • aaronq
this one you might not get
anonymous
  • anonymous
#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?? :/
anonymous
  • anonymous
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
aaronq
  • aaronq
hahaha wow, good stuff (Y)
anonymous
  • anonymous
#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? :/
aaronq
  • aaronq
10 is right, B
anonymous
  • anonymous
#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 :)
anonymous
  • anonymous
#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?
aaronq
  • aaronq
11 is good!
anonymous
  • anonymous
yay :)
aaronq
  • aaronq
12 is good
anonymous
  • anonymous
#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?? :)
aaronq
  • aaronq
for 13, you have to know that Xe(g) is not diatomic, so you know 1 mole = 6.022x10^23 atoms/molecules
aaronq
  • aaronq
14 is good also!
anonymous
  • anonymous
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 :(
aaronq
  • aaronq
anonymous
  • anonymous
so 13 would be D. 6.0 × 10^23 ??
anonymous
  • anonymous
lol that was a good one :P and that kitty is so cute with the glasses and stuff!! =)
aaronq
  • aaronq
yes 13 is D, noble gases are ALWAYS unimolecular. uni=1
anonymous
  • anonymous
awesome! :)what about 15 tho?? and i found a good one hahaha :P i like this one :)
aaronq
  • aaronq
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
aaronq
  • aaronq
HAHA I've never seen that one, i like it
anonymous
  • anonymous
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 :)
anonymous
  • anonymous
anonymous
  • anonymous
and this one :P
aaronq
  • aaronq
nope! 11 g
aaronq
  • aaronq
"ALL THESE CHEM JOKES ARE BORON ME" LOL
anonymous
  • anonymous
and i liked this one too :P
aaronq
  • aaronq
aaronq
  • aaronq
haha periodically
anonymous
  • anonymous
okay!! :) thanks!! :) and lol that ones good :) and heres another one.. but its with... the one and only!!! PAtrick... STar!!!!
aaronq
  • aaronq
oh wait i added up the molar mass of N2O wrong i did NO2
aaronq
  • aaronq
lol it's still 11 grams
anonymous
  • anonymous
okay!! haha thanks!! :D
aaronq
  • aaronq
:) no prob haha i haven't watched spongebob in like i don't even know, forever.
anonymous
  • anonymous
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
aaronq
  • aaronq
it is so awesome, i liked the movie too! no problem at all!
anonymous
  • anonymous
yeah!! haha i watched it a while ago but all spongebob is good and funny :)
aaronq
  • aaronq
agreed :) i'm gonna go, see ya !
anonymous
  • anonymous
byebye! :D

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