1. Nhiệt dung của một chất là gì? Tính nhiệt lượng cần thiết để nâng nhiệt độ của 200 gam nước từ -200C đến 2000C ở áp suất 1 atm. Biết rằng: Nhiệt nóng chảy của nước ở 2730K: H0nc = 6004 J/mol;
Nhiệt bay hơi của nước ở 3730K: H0bh = 40660 J/mol;
Nhiệt dung: 35,56 J/mol. K; 75,3 J/mol. K; 30,2 J/mol. K

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

What four properties do all waves have in common

In the haber reaction, patented by german chemist fritz haber in 1908, dinitrogen gas combines with dihydrogen gas to produce gaseous ammonia. this reaction is now the first step taken to make most of the world's fertilizer. suppose a chemical engineer studying a new catalyst for the haber reaction finds that 671 liters per second of dinitrogen are consumed when the reaction is run at 271c and 0.99atm. calculate the rate at which ammonia is being produced. give your answer in kilograms per second. round your answer to significant digits.