Classify the type of electrolyte: CH3OH(l) CH3OH(aq) A. strong B. weak C. non Th
ID: 1021313 • Letter: C
Question
Classify the type of electrolyte: CH3OH(l) CH3OH(aq) A. strong B. weak C. non The initial volume of a gas cylinder is 750.0 mL. If the pressure of a gas inside the cylinder changes from to , what is the final volume the gas occupies? A. 630.0 mL B. 321.4 mL C. 3.151 L D. 1.750 L E. none of the above What is the molar mass of a gas that has a density of 0.179 g/L at STP? A. 4 B. 22 C. 8 550 ml of O2 is collected over water at 1.20 atm and 50oC. Calculate the volume of O2(dry) at STP. A. 550 mL B. 501 mL C. 542 mL How many grams of aluminum will 10 fardays plate out? A. 270 B. 90 C. 1.11 15.0g of a substance at -60.0oC is heated to 0oC. Calculate the heat, in calories, gained by the substance. (boiling point -50.0oC, freezing point -84oC, heat of fusion 7.7cal/g, heat of vaoprization 30.0 cal/g , specific heat(solid) 0.50cal/goC , specific heat (liquid) 0.70cal/goC, specific heat (gas) 0.80cal/goC, you may not need to use all this information) A. 1155 B. 2356 C. 6300 Please show work if possible. Thank you
Explanation / Answer
Classify the type of electrolyte: CH3OH(l) CH3OH(aq)
CH3OH is weak electrolyte.
B. weak
Initial Final
V1 = 750ml V2 =
P1 = 840mmHg P2 = 360mmHg
P1V1 = P2V2
V2 = P1V1/P2
= 840*750/360 = 1760ml >>>> answer
density = 0.179g/L
22.4 L -----------------> 1 mole
1L --------------------> = 1/22.4 = 0.0446 moles
molar mass = mass/no of moles
= 0.179/0.0446 = 4g/mole
A. 4
intial STP
P1 = 1.2-0.12 = 1.08atm P2 = 1
V1 = 550ml V2 =
T1 = 50+273 = 323K T2 = 273K
P1V1/T1 = P2V2/T2
V2 = P1V1T2/T1P2
= 1.08*550*273/323*1 = 502.05ml >>> answer
B. 501 mL
How many grams of aluminum will 10 fardays plate out
1farady ------------------------> 9 g of Al
10F ----------------------------> 9*10 = 90g of Al
B. 90