A gas, while expanding absorbs 25 J of heat and does 243 J of work. What is DU for the gas?
A: 268J
B: -218J
C: 218J
D: -268J
A: 268J
B: -218J
C: 218J
D: -268J
举一反三
- DU = 100 J is for a system that gives off 100 J of heat and ( ) A: does no work B: does 200 J of work C: has 100 J of work done on it D: has 200 J of work done on it.
- One mole of hydrogen with an initial temperature of 27℃ expands<br/>and in the process, absorbs 4000 J of heat and does 3000 J of work,<br/>the<br/>final temperature of the gas is () A: 62.3℃ B: 105.6℃ C: 75.1℃ D: 56.3℃
- A<br/>gas enclosed in a cylinder by means of a piston that can move without<br/>friction is warmed, and 1000 J of heat enters the gas. Assuming that<br/>the volume of the gas is constant, the change in the internal energy<br/>of the gas is [] A: 0 B: 1000<br/>J C: -1000<br/>J D: None<br/>of the above
- 以下选项中没有语法错误的是（ ） 。 A: while (int i<7) { i++; System.out.println(“i is “+i); } B: int j=3; while(j) { System.out.println(“ j is “+j); } C: int j=0; for(int k=0; j + k !=10; j++,k++) { System.out.println(“ j is “+ j + “k is”+ k); } D: int j=0; do{ System.out.println( “j is “+j++); if (j == 3) { continue loop; } }while (j<10);
- p=1 j=1do while j if j mod 3=0 then p=p*j else s=s+p endif j=j+1 loopdebug.print j,s A: 44,9 B: 45,10 C: 43,11 D: 42,9