Chemistry easy question.. can u check if my mass calculation is correct what mass of CaO is formed ….?
yes that’s correct… the molar mass of calcium carbonate (CaCO3) is around 100g/mol and the molar mass of calcium oxide (CaO) is around 56g/mol. CaCO3 decomposes according to the following equation: CaCO3 -> CaO + CO2 Therefore every mole of CaCO3 that decomposes will produce a mole of CaO. Assuming all of the CaCO3 decomposes: (i) # moles CaCO3 = mass CaCO3 / molar mass CaCO3 (ii) # moles CaO = # moles CaCO3 (iii) mass CaO = molar mass CaO * # moles CaO Using these equations in sequence with the above listed values will result in the answer you obtained. Using the more accurate molar masses of 100.087 and 56.077 will basically result in the same answer (since the answer shouldn’t be given with more decimal places than the ‘starting’ value of 25g) The above three equations can be summarised as one equation with: mass CaO = (molar mass CaO / molar mass CaCO3) * mass CaCO3 anyway… sorry that the answer’s on the lengthy side and for my rambling… hope it was helpful…
