Hãy nêu ý nghĩa của các công thức hóa học sau:

a. Khí nitơ : N2.

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

The primary products of complete combustion of fossil fuels are a. carbon dioxide and water b. methane and water c. carbon monoxide and water d. carbon dioxide and carbon monoxide