A patient was injected with Tc-99m 12 hrs ago to complete a bone scan and 3.0 mCi remains in her blood stream. If the half life of Tc-99m is 6 hrs. How much Tc-99m was she injected with?

What are the resulting coefficients when you balance the chemical equation for the combustion of ethane, c2h6? in this reaction, ethane is burned in the presence of oxygen (o2) to form carbon dioxide (co2) and water (h2o). (g)+(g)→(g)+(g)

Some animals that try to adapt to climate changes eventually die due to starvation, as climate change alters the web.

Consider the following multistep reaction: a b→ab(slow) a ab→a2b(fast)−−−−−−−−−−−−−−−−− 2a b→a2b(overall) based on this mechanism, determine the rate law for the overall reaction. express your answer in standard masteringchemistry format. for example, if the rate law is k[a]3[b]2 type k*[a]^3*[b]^2