exercise 4

EXERCISE

1. Calculate the relatives molecular mass below:

2. Ammonia, NH3


3. Calcium hydroxide, Ca(OH)2



4. Lead(II) nitrate, Pb(NO3)2



5. Hydrated copper(II) sulphate, CuSO4.5H2O


6. ZnSO4.7H2O


7. Cu(NO3)2.3H2O


8. The relative formula mass of compound X2O3 is 102. Find the relative atomic mass of atom X




9. The relative molecular mass of substance XH4 is 16. Find the relative atomic mass of atom X




10. Adrenaline is produced by the adrenal gland. Adrenaline has formula C9H13NOX. If its relative molecular mass is 183, determine the value of X. Then write the molecular formula of adrenaline