Using the formula for mass, we have
mass= density x volume
mass of C2H5OH= (0.789 g/mL) x (516 mL)
= 407.124 g
mass of beaker= 0.245 kg = 245 g
Total mass= mass of C2H5OH + mass of beaker
= 407.124 g + 245 g
= 652.124 g
Polonium is so radioactive it glows blue, which is caused by excitation of the gas particles by radiation. A single milligram of polonium emits as many alpha particles as 5 grams of radium. It decays to release energy at the rate of 140W/g. The decay rate is too high that it can raise the temperature of a half gram sample of polonium to over 500°C and subject you to a contact gamma-ray dose rate of 0.012 Gy/h, which is more than enough radiation to kill people.
answer: Air cannot be classified as a substance. In particular, air cannot be classified as a “pure substance” because it is a homogenous mixture of different elements or substances while table salt, nitrogen, and gold can be considered as substance due to their basic chemical properties.