Asample of no2(g) is initially placed in a 2.50-l reaction vessel at 300°c. if the half-life and the rate constant at 300°c are 11 seconds and 0.54 m-1 s-1, respectively, how many moles of no2 were in the original sample? nitrogen dioxide decomposes at 300°c via a second-order process to produce nitrogen monoxide and oxygen according to the following chemical equation. 2 no2(g) → 2 no(g) + o2(g). a sample of no2(g) is initially placed in a 2.50-l reaction vessel at 300°c. if the half-life and the rate constant at 300°c are 11 seconds and 0.54 m-1 s-1, respectively, how many moles of no2 were in the original sample? 0.17 mol 15 mol 0.42 mol 5.9 mol

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.)

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Building glycogen from glucose molecules is an example of