The amount of nitrogen in an organic substance can be determined by an analytical method called the kjeldahl method, in which all the nitrogen in the organic substance is converted to ammonia. the ammonia, which is a weak base, can be neutralized with hydrochloric acid, as described by the equation nh3(aq)+hcl(aq)⟶nh4cl(aq) nh3(aq)+hcl(aq)⟶nh4cl(aq) if 88.0 ml88.0 ml of 0.150 m hcl(aq)0.150 m hcl(aq) is needed to neutralize all the nh3(g)nh3(g) from a 2.25 g sample of organic material, calculate the mass percentage of nitrogen in the sample.

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.)

What is the standard unit of measure for acceleration?

Which type of intermolecular force is pbr3