Water (h2o) and methane (ch4) have similar molar masses. methane changes from a liquid to a gas at -161oc. water becomes a gas at 100oc. what could account for this difference

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth

Use the half-reactions of the reaction au(oh)3 + hi -> au +i2 +h2o to answer the questions