What would be the effect on the calculated ratio (mole of copper:mole of iron) if: (a)some iron had been spilt?

(b)The iron fillings were not 100% pure?

(c)Some copper had been spilt?

(d)The copper was not completely dry?​

Explanation:

Since the ratio is Cu/Fe, if some Fe were lost due to spillage, the Cu/Fe ratio would INCREASE because Fe would be lower.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.