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:

Aballoon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon?

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?

Name atleast 3 type of energy associated with the microwave