Cho 18,9 gam nhôm tác dụng hết với dung dịch HNO3 thu được hỗn hợp khí N2, N2O, NO (với tỉ lệ mol tương ứng là 1:2:3), không tạo NH4NO3. a. Tính số mol mỗi khí thu được.
b. Tính số mol HNO3 đã tham gia phản ứng

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

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