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