Answer:
Explanation:
Inquiry making is one of the methodical approaches to scientific investigation. Inquiry basically deals with asking question and querying a certain procedure or observation. In almost all the phases of a scientific investigation, the scientist will not cease to keep on asking questions that are connected to the observations and how this can help to further broaden the scope of the experiment. In fact, every investigation in science is an inquiry into a phenomenon and this generates series of questions that need to be satisfied.
197 grams is the mass of one atom of gold
It doesn't take much energy to remove one electron from a sodium atom to form an Na+ ion with a filled-shell electron configuration. The first ionization energy of magnesium is larger than sodium because magnesium has one more proton in its nucleus to hold on to the electrons in the 3s orbital.
Answer:
The enthalphy change of the given reaction is -280 KJ.
Explanation:
X 2 + 3 Y 2 ⟶ 2 XY 3 Δ H 1 = − 380 kJ ....Eq-1
X 2 + 2 Z 2 ⟶ 2 XZ 2 Δ H 2 = − 130 kJ ....Eq-2
2 Y 2 + Z 2 ⟶ 2 Y 2 Z Δ H 3 = − 260 kJ ....Eq-3
4 XY 3 + 7 Z 2 ⟶ 6 Y 2 Z + 4 XZ 2 ΔH ....Eq-4
<em>By Hess law,</em>
<em> The heat of any reaction ΔH for a specific reaction is equal to the sum of the heats of reaction for any set of reactions which in sum are equivalent to the overall reaction:</em>
Eq-4 can be manipulated as,
Eq-4 = -2(Eq-1) +2(Eq-2) +3(Eq-3)
By Hess law, same happen with their enthalphy
Therefore,
ΔH = -2(ΔH1) + 2(ΔH2) + 3(ΔH3)
= -2 × -380 + 2 × -130 + 3 × -260
= -280 KJ
