Which equation obeys the law of conservation of mass?
2 answers:
Explanation:
According to law of conservation of mass, total mass of reactants will be equal to the total mass of products.
For example,
Therefore, mass of reactant molecules will be as follows.
Mass of HCl is 36.46v g/mol
Mass of NaOH is 39.99 g/mol
Total mass of reactants is (36.46 + 39.99) g/mol = 76.45 g/mol
Mass of product molecules will be as follows.
Mass of NaCl is 58.44 g/mol
Mass of is 18.01 g/mol
Total mass of products is (58.44 + 18.01) g/mol = 76.45 g/mol
Thus, we can conclude that any equation which represents total mass of reactants equal to the total mass of products is actually obeying the law of conservation of mass.
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Answer:
Explanation:
From the given information:
mass of silver chloride AgCl = 11.89 g
molar mass of AgCl = 143.37 g/mol
We know that:
number of moles = mass/molar mass
∴
number of moles of AgCl = 11.89 g/ 143.37 g/mol
number of moles of AgCl = 0.0829 mol
The chemical equation for the mineral called trona is:
when being reacted with hydrochloric acid, we have:
One mole of NaCl formed from one mole of trona sample = 0.0829 moles of AgCl
i.e. 0.0829 moles of NaCl can be formed from AgCl
mass of trona sample = number of moles × molar mass
mass of trona sample = 0.0829 × 226
mass of trona sample = 18.735 g
The mass in the percentage of NaHCO₃ = mass of NaHCO₃/ mass of trona
The mass in the percentage of NaHCO₃ = 6.93/18.735
The mass in the percentage of NaHCO₃ = 0.36989
The mass in the percentage of NaHCO₃ = 36.99%
Nonetheless, a 6.78 g samples manufactured from sodium carbonate in pure 100%
∴
6.78 g sample manufactured from Na₂CO₃ is purer.