Hydrogen (H) was first, followed by helium (He).
Answer:
Do you need the definition or the equation to find it?
Explanation:
Equation:
Mass=volume x density
Lead (II) chloride+ potassium nitrate
PbCI2+KNO3(B)
Answer:
By measuring it's Radical velocity using Doppler Phenomenon...
Explanation:
It is done by measuring the absorption spectrum produces by a star as a result of measuring Doppler's relative wavelength. The star with the lower speed must have lower absorption spectrum extent as compared to the faster one.
2KClO3 --> 2KCl + 3O2
3 moles of oxygen are produced when 2 mol of potassium chlorate (KClO3) decompose.
