121.0 g of nh3 is mixed with 202.3 g of o2 and allowed to react. the reaction is complete when the nh3 is consumed. 99.56 g of n2 is formed and 31.80 g o2 remain unreacted. what mass of h2o is produced?

Which type of bond is found between the atoms of a molecule? a. metallic b. delocalized electron c. covalent d. ionic

In a system, when potential energy decreases, then entropy also decreases. true false

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.