What substance is helium in helium balloon?

NO, a gas formed by the reaction of N2 with O2 in internal combustion engines

A meteorological balloon contains 250.0 l he at 22°c and 740.0mmhg if the volume of the balloon can vary according to external conditions what volume would it occupy at an altitude at which the temperature is - 52°c and the pressure is 0.750 atm

Which two nuclei are fused in a thermonuclear weapon? a. hydrogen and tritium c. carbon-13 and deuterium b. tritium and deuterium d. None of the above

8. A sample of sulfur has a mass of 223 g. How many moles of sulfur are in the sample?

What does a geologist study

How does phosphorus enter the human body?

When a reaction occurs between atoms with ground state electron configuration 1s2 2s1 and 1s2 2s2 2p5 the predominant type of bond formed is

How does heat transfer takes place between any two systems?

Hydrate name of CaCl2 * 8 H2O

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide