How many grams of mg3n2 are in 4.5 molew of mg3n2

First we must find the molar weight of 1 mole of . We take the atomic mass from the periodic table of each of the elements and that is the molar weight, in grams, for 1 mole of that element.

We know that in the chemical formula of , we have 3 moles of Mg and 2 moles of N. So we need to multiply these numbers in order to get the correct amount for the compound:

Mg:

N:

So then we add these two together to get the total molar weight of the compound, :

So now we know that the molar weight of is

We want to know how many grams are in 4.5 moles, so we must multiply and cancel out the units:

Now we know that there are 454.18 grams of in 4.5 moles of .

b. th3 n4zc4 pl4t3 15 c0nv3rg1ng w1th the s0uth 4m3ric4n pl4t3.

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.