Which of the following statements is correct?View Available Hint(s)Consider the two Lewis structures given below:Lewis representation of BCl3Lewis representation of NH3Which of the following statements is correct?Structure 1 can be classified as both a Brønsted–Lowry and a Lewis acid. Structure 2 would have similar Lewis acid–base properties as those of AlCl3.Structure 2 can be classified as both a Brønsted–Lowry and a Lewis base. In a reaction, structure 1 would function as a Lewis base while structure 2 would function as a Lewis acid.

AlCl3.Structure 2 can be classified as both a Brønsted–Lowry and a Lewis base.

Explanation:

Let us recall that a Lewis acid is a lone pair acceptor while a Lewis base is a lone pair donors.

A Brownstead-Lowry acid is a proton donor while a Brownstead-Lowry base is a lone pair acceptor.

NH3 functions as a Lewis base because it can donate it's lone pairs in coordinate covalent bonding.

It can also accept a proton thereby acting as a Brownstead-Lowry base in the formation of the NH4+ ion.

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