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April 19, 2014

Homework Help: Chemistry

Posted by Hannah on Friday, January 20, 2012 at 5:58pm.

The four statements below are used for applications of Hess's law. One of the statements is erroneous. Choose that statement.

a) the value of delta H for any reaction that can be written in steps is the sum of the values of delta H for each of the individual steps.

b) when an equation is reversed- written in the opposite direction- the sign of delta H must also be reversed (+ becomes - or - becomes +)

c) formulas cancelled from both sides of an equation must be for substances in identical physical states.

d) The value of delta H is independent of the stoichiometry, so that, if we change the equation, delta H does not change.

I chose d as the answer that is erroneous. Is this correct?

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