So to get the answer use the equation: moles = mass/ RAM the RAM is the relative atomic mass and can be calculated by using the bottom number in the box of the element on the periodic table so for this question the mass of P4 is 161g and the RAM of P4 is 124 (31 X 4) so 161/124 = 1.3 and because you need to work out P2O5 and not P4 2 is half of 4 so you half the moles so the answer should be 0.65
Remember the fact
Randomness follows the order
#System A
As solid particles are dissolved in water their randomness increases so entropy increases
#System B
Gas is converted to liquid so entropy decreases as randomness decreases
Answer:
The answer to your question is the letter d. -132.8 kJ
Explanation:
To solve this problem, just observe that the ΔH is originally equal to +66.4 kJ.
If we change the order of the reaction, ΔH changes its sign but the value is the same.
Finally, if we duplicate the number of moles, also the ΔH increases twice.
For this problem
ΔH = 2(-66.4 kJ)
ΔH = - 132.8 kJ