Cho chu trình làm lạnh dùng máy nén hơi môi chất là R134a. Hơi bão hoà khô R134a vào máy nén có i=390 (kJ/kg), ra khỏi máy nén có i=410 (kJ/kg). Trước van tiết lưu có i=220 (kJ/kg). Xác định năng suất lạnh riêng và hệ số làm lạnh của chu trình?.

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

How much heat is released upon converting one mole of steam (18.0 g) from 100.0 ∘c to water at 25.0 ∘c? show work and constants, trying to figure out how it works. only given the heat capacity for steam and water so try to only use that

Compare the equilibrium constants for the systems shown in the table. which favors products the most? which favors products the least? rank these systems in order from most to least in terms of favoring products rather than reactants. d > b > a > c c > a > b > d b > c > d > a a > d > c > b