Which of the following can be calculated from the mass of the reactants used in a chemical reaction?Amount of limiting reactant used in a reactionActual yield of productsAmount of excess reactant from a reactionTheoretical yield of products
Explanation:
There are some options that are correct.
1) Amount of limiting reactant used in a reaction.
It can be calculated from the quantity of the reactants.
2) Amount of excess reactant from a reaction
It can be also calculated from the quantity of the reactants.
3) Theoretical yield of products
Amount of limiting reactant used in a reaction
Amount of excess reactant from a reaction
Theoretical yield of products
c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.
s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.
answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol
explanation :
let us write down the given equations
equation 1 :
equation 2 :
equation 3 :
let us use hess's law to find out which 2 equations can be added to get the third equation.
let us reverse equation 2 and multiply it by 2. the new equation that we get is,
equation 4 :
let us add equation 1 & 4
the above equation is similar to equation 3 but has different value for dhrxn.
therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol