Calculate percent yield or determine the limiting reactant: Use the equation:
2 HCl(aq) + Mg(s) → MgCl2(s) + H2(g)
1. Determine the limiting reactant if you have 20g of HCl and 10g of Mg.
2. Determine the percent yield if you produce 5g of MgCl2 from 20g of HCl. (you
must first calculate theoretical yield).

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

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