Question

QUESTION 9 Enter the value of the enthalpy of hydration of CuSO4 (that is, AH1) that you determined in Part Use three significant figures, in units of kJ/mol. If your enthalpy change was positive, do not include a "+" sign with your entry; however, if it was negative, make sure you include a "-" sign in front of your numeric value. 1 points Save Answer

Answer 1

ANSWER

According to Hess's low, the determined value of hydration enthalpy of CuSO4 is the -77.7 KJ/mol.

Concept of significant Figure:- The number of significant figure in a result simply the number of Figure that are known with some degree of reliability. i.e 14.3 is three significant and 15.44is four significant.

Rules for deciding the number of significant figure in a measured quantity.

1) All non zero digit are significant figure, eg-1.342g is four significant figure and 137kg is three.

2) Zeroes between nonzero digit are significant figure, eg- 1.06kg is three significant figure and 1005ml is four significant figure.

3) Zero to the left of the first nonzeros digit are not a significant, eg- 0.0001°C is one significant and 013kJ is two significant.

4) Zero is the right of the nonzero decimal point are significant figure, eg- 0.100kg is three significant.

5) When a number ends in zero that are not to be right of a decimal point, the zero are not necessarily significant figure, eg-150 miles may be 2 Or 3 significant, 50600 cal may be 3 Or 3 Or 5 significant and 5.06 ×10^4 is three significant figure.