The initial rates for the following two elimination reactions were measured under different concentrations of the electrophiles and bases (H2O in the top reaction, KOCH2CH3 in the bottom reaction; all data is presented in the two tables. For each reaction, top and bottom, does the data suggest an E1 or E2 reaction pathway (rates are all 10-x units)? Explain. Write the rate equations for each reaction.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Idon’t know how to solve this question

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)