Cho 10gam amin đơn chức X (CxHyN) phản ứng hoàn toàn với HCl (dư), thu được 15gam muối. Số đồng phân cấu tạo của X?

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.