School and Work

Find the limits of integration for calculating the volume of the solid, Q, enclosed by the graphs of y = x2 , z = 0, and y + z = 2.

I'm not confident in my results could someone show me how this is done?

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Consider the reaction: 2NO2 (g) ? N2O4 (g)

Calculate ?G at 298 K if the partial pressures of NO2 and N2O4 are 0.36 atm and 1.64 atm, respectively.

I used ?G= -RT(lnK)
K= (1.64 atm) / (0.36 atm)^2 = 12.65
R= 8.314
?G= -(8.314)(298K)ln(12.65) = -6287.23

The answer calls for 1 sig fig (online homework) so I put -6000, but got it wrong..then I noticed it has to be in kJ, so i put -6 & still got it wrong. What am I doing wrong here? Anybody help? Thanks!

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Home >All Categories > Science & Mathematics >Engineering >Open Question Marisa Member since:September 08, 2010Total points:156 (Level 1)In the Alka Seltzer Lab, a group doing the experiment found the pressure in the room to be 761.1 mmHg. The water was at 22.2 C. Water at this temperature has a vapor pressure of 20.070 mmHg. Calculate the pressure of the gas generated by the Alka Seltzer (CO2).Answer Question

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C2H4(g) + H2(g)----------> C2H6(g) ?H=??

Data:

C2H4(g) + 3O2(g) ---------> 2CO2(g) + 2H2O(l) ?H= -1410.9kJ
2C2H6(g) + 7O2(g) --------> 4CO2(g) + 6H20(l) ?H= -3119.4kJ
2H2(g) + O2(g) ------------> 2H2O(l) ?H= -571.6kJ

Im really confused and can not get this on my own

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Home >All Categories > Science & Mathematics >Physics >Open Question alyna Member since:January 20, 2011Total points:164 (Level 1)I understand how to calculate percent change in mass, but if I have to calculate change over 4 days, would the initial mass remain as the mass from Day 1? or would it change to the previous day?
For example, if Day 1 was 6.65, Day 2 was 5.9, and Day 3 was 5.39, and I had to calculate the percent change of Day 3, would the "initial mass" in the equation be 6.65 (Day1) or 5.9 (Day 2…previous day)
thanks SO MUCH, I can't figure this out!Answer Question

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