Hellpp Directions: Write True if the statement is correct, and false if it is incorrect.

1. The molecular formula can be calculated from the empirical formula if the molar

2. The molar mass represents the total mass, or 100 % of the compound.

mass is unknown.

3. Molecular formula gives the relative number of atoms of each element in the compound. 4. We can obtain the molecular formula from the empirical formula if we know the

molecular weight of the compound.

5. If a compound's chemical formula cannot be reduced any more, then the empirical formula is the same as

the molecular formula.​

Explanation:I think that there should be no explaing and straight to the showing.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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.