đốt cháy hoàn toàn m gam hỗn hợp E gồm hai amin no, mạch hở Y, Z ( có số mol bằng nhau, là đồng đẳng kế tiếp) và propan-1-ol cần vừa đủ 1,5 mol O2, thu được N2 , h2O và 0,8 mol Co2. Phần trăm khối lượng của Y trong E là ?

Suppose the universe were completely empty except for one object-a solid sphere moving through space of 100 km/s. what sort of path would the object be moving in? explain your answer

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity