How many moles of Sis2 will be produced if 3.25 grams
CuS is completely reacted?
Si + 2Cus → 2Cu + Sis2

    0.000170 mol

Explanation:

This problem can be solved using dimensional analysis:

3.25g CuS × × = 0.000170 mol

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

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.