Oxi có 3 đồng vị là 816O, 817O, 818O. Cacbon có 2 đồng vị là 612C, 613C. Số loại phân tử khí CO2 có thể tạo thành là:

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6