Answer:
15 mol Mg
Explanation:
Step 1: Find conversions
Avagadro's Number: 6.022 × 10²³
Step 2: Use Dimensional Analysis
= 14.6179 mol Mg
Step 3: Simplify
We have 2 sig figs.
14.6179 mol Mg ≈ 15 mol Mg
Answer:
hardness-Hardness is the ability of a material to resist deformation
luster-the way light interacts with the surface of a crystal
color-the quality of an object or substance with respect to light reflected by the object
streak- the color of the powder produced when it is dragged across an un-weathered surface.
specif gravity-the density of that object divided by the density of water cleavage -the tendency of a mineral to break along smooth planes
fracture-any separation in a geologic formation
tenacity-refers to a mineral's toughness or resistance to breaking or being deformed.
lol sorry that took awhile
-130KJ is the standard heat of formation of CuO.
Explanation:
The standard heat of formation or enthalpy change can be calculated by using the formula:
standard heat of formation of reaction = standard enthalpy of formation of product - sum of enthalpy of product formation
Data given:
Cu2O(s) ---> CuO(s) + Cu(s) ∆H° = 11.3 kJ
2 Cu2O(s) + O2(g) ---> 4 CuO(s) ∆H° = -287.9 kJ
CuO + Cu ⇒ Cu2O (-11.3 KJ) ( Formation of Cu2O)
When 1 mole Cu20 undergoes combustion 1/2 moles of oxygen is consumed.
Cu20 + 1/2 02 ⇒ 2CuO (I/2 of 238.7 KJ) or 119.35 KJ
So standard heat of formation of formation of Cu0 as:
Cu + 1/2 02 ⇒ CuO
putting the values in the equation
ΔHf = ΔH1 + ΔH2 (ΔH1 + ΔH2 enthalapy of reactants)
heat of formation = -11.3 + (-119.35)
= - 130.65kJ
-130.65 KJ is the heat of formation of CuO in the given reaction.
An exothermic reaction is a chemical reaction that releases energy by light or heat.
Protons and neutrons, just like in the nucleus of every other element.
