How many total atoms are in 0.220 g of p2o5?

From the periodic table:
molecular mass of P = 30.9 grams
molecular mass of O = 16 grams
Therefore:
molar mass of P2O5 = 2(30.9) + 5(16) = 141.8 grams

Number of moles = mass / molar mass = 0.22/141.8 = 1.55 x 10^-3 moles

One mole of any substance contains Avogadro's number of atoms. Therefore, number of atoms in 1.55 x 10^-3 moles is:
1.55 x 10^-3 x 6.022 x 10^-3 = 9.34 x 10^20 atoms

Copper, silver, aluminum, cobalt, chromium, mercury 

Answer : option c) heat is released during the process.explanation :

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.