Ca(OH)2 -------> CaO + H2O
ratio is 1 : 1
CaO Mr= 56g
15/56 = 0.268 mol (mols of CaO in 15g)
Ca(OH)2 Mr= 74g
0.268x74= 19.83g (required amount of Cash(OH)2)
Hope this helps you with yoyrslef
Answer:
there is your answer hope it helped :3
The equation for the reaction is as follows;
NH₃ + HCl --> NH4Cl
one of the 2 reactants have been added in excess, to find out which reactant is in excess we need to find the number of moles of each reactant
NH₃ moles reacted - 6.01 g / 17 g/mol
= 0.35 mol
HCl moles reacted = 4.91 g / 36.5 g/mol
= 0.13 mol
the stoichiometry of NH₃ : HCl = 1:1
therefore the number of moles reacted should be equal, however NH₃ there are more moles than HCl which means that NH₃ has reacted in excess
the number of NH₃ moles that would have reacted = 0.13 mol
The mass of NH₃ reacted = 0.13 mol * 17 g/mol
= 2.21 g
the excess amount of reactant is = 6.01 g - 2.21 g
= 3.8 g
the answer is 3.8 g
Answer:
See below
Explanation:
The atmosphere of the earth hundreds of millions of years ago was only water vapour and carbon, both from the one ocean that existed around the continental body of Pangea. The photosynthesis process and exache (⊕) caused the percentages to decrease.