Chem122 Midterm one particular
SIMPLY NO books, notes from a class, cell-phones, PDAs, laptops, talking.
For Multiple Choice Challenges (on the back) -- Circle the answer to every single question BELOW.
If more than one answer is usually circled for the question simply no credit will be given for it.
1 . [ away of 18 pts ] A combination of gases consists of 66. 0 g CARBON DIOXIDE, 2 . 02 g of H2, and 16. zero g of O2. In the event the total pressure of the mixture is 725 torr, precisely what is the part pressure of each and every gas?
[ usually do not neglect significant figures! ]SHOW YOUR JOB to acquire full credit.
1) Range of moles:
2) Pressure of each gas:
2 . [ out of 16 pts ] When 11. 1 g of business lead reacts with 3. seventy eight L of oxygen gas, measured by 1 . 00 atm and 25. 0В°C, 11. eight kJ of heat is unveiled at constant pressure. Precisely what is в€†HВ° just for this reaction? (R = 0. 0821 D вЂў atm/(K вЂў mol))
2Pb(s) + O2(g) в†’ 2PbO(s)
[ tend not to neglect significant figures! ]SHOW YOUR FUNCTION to acquire full credit.
1) Decide the constraining reactant:
2) Figuring out О”HВ°:
If uncertain, show every one of the relevant operate to receive partial credit rating for the multiple-choice questions.
3. [ 12 pts ] What volume of nitrous gas, N2O, has the same number of atoms as on the lookout for. 00 L of fluorescents gas additionally temperature and pressure?
a)36. 0 L
b)9. 00 L
c)3. 00 L
d)2. 25 L
e)27. 0 D
4. [ doze pts ] The high temperature necessary to raise the temperature of 55. eighty-five g of iron by simply 1В°C is referred to as its
c)heat of fusion.
d)heat of vaporization.
e)molar temperature capacity.
a few. [ 12 pts ] Which with the following gases will have the slowest rate of effusion at regular temperature? a)CF4
6. [ doze pts ] Each of the following transactions are authentic for a great exothermic reaction except a)The temperature in the reaction program increases.
b)The temperature from the surroundings increases.
c)Heat goes from the reaction system for the surroundings. d)The products have got...