# Use the periodic table to help you..

Use a periodic table to help you..? Element A has a relative atomic mass of 4 Element B has a relative atomic mass 3 times that of element A Element C has a relative atomic mass 4 times that of element A

Element A is .............. Element B is .............. Element C is ..............

What are the relative formula masses of the following?

water potassium hydroxide nitric acid sulfuric acid ammonium nitrate

Answers
help please
liamm2195
11 November 2012
Hi liam, I could help you understand this topic if you would like?
jackapplebee
14 November 2012
Hi Liam, A is helium He, B is carbon C and C is oxygen O. Let me know if you would like some more help and an idea how to work out the formula masses.
jgopee
16 November 2012
Hello Liam , A is Helium B is Carbon and C is Oxygen
Prabalini K.
17 November 2012
Relative formula mass of Water H2O = 1X2+16 =18, Potassium hydroxide (KOH) = 39+16+1=56, Nitric acid (HNO3) =1+14+3x16=63, Sulfuric acid (H2SO4)=1x2+32+4x16=98, Ammonium nitrate NH4NO3= 14+1x4+14+3x16=80 I could help you this topic if you would like?
Prabalini K.
17 November 2012