The highly reactive elements in group 7A are known for forming salts? what are they called

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.