In the chemical reaction below, sodium (na) and chlorine (cl) combine to form sodium chloride (nacl). 2na + cl2 → 2nacl if the combined mass of the starting reactants is 50 grams, then the mass of sodium chloride formed once the reaction has reached completion a. will be exactly 50 grams. b. will be exactly 100 grams. c. will be between 50 and 100 grams. d. will be less than 50 grams.

In which type of system is power held solely by the central government and not shared with regional governments? group of answer choices federal unitary confederate oligarchic

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.

You are doing a science experiment with a fahrenheit thermometer. your data must be in degrees celsius. if you measure a temperature of 125°f, what is this temperature in degrees celsius