Answers by visitors named: Irina

thank you so much!!!

thank you

i just did it Q(200) = 300 e^(-0.000324*200) = 281.176 But for b) and c) web work doesn't accept my answers Q(50000) = 300 e^(-0.000324*50000) = 0.000028 maybe i should multiply by something...

delta E = w + q q=570 J V1 = 0.12 L V2 = 0.88 L delta V = 0.88 L - 0.12 L = 0.76 L w = -P x delta V w = -1.0 atm x 0.76 L = -0.76 L atm You need to convert L atm to J -0.76 L atm / 1 L atm x 101.3 J = -76.99 J delta E = -76.99 J + 570 J = 493 J Mastering Chemistry accepts this answer as Correct

Consider the following sum 1/4*5+1/5*6+1/6*7+ ...+1/18*19 If it were written in sigma notation as a= b= f(i)=

8/sqrt(81)=8/9=0.89

Answer is B