How many moles of au atoms are in 2.56 gm

hey there:

Molar mass of Au = 196.96 g/mol

Therefore:

moles of Au atoms = mass Au / molas mass

moles of Au atoms = 2.56 / 196.96

moles of Au atoms = 0.0123 moles

Hope that helps!

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.

the awnser is group 12