A50 g piece of aluminum is heated to 800c and then dropped into cold water, where the metal's temperature drops to 300c. how many calories does it lose to water? (specific heat capacity of aluminum is .21 cal/g0c)

Consider the combustion of ethylene: c2h4(g)+3o2(g)→2co2(g)+2h2o(g) if the concentration of c2h4 is decreasing at the rate of 3.6×10−2 m/s , what is the rate of change in the concentration of co2? express the rate in molarity per second to two significant digits.