Yang jago zat dan kalor mohon bantuannya yaa!

0,5liter = 500ml - 4,5ml = 0,5ml

1,0×10^-5 =1/100000
2,1×10^-4 = 2,1/10000 = 21/100000

21/100000 - 1/100000 = 20/100000 =
2/10000c
20×0,5 = 40c

40c + 5 = 45c