Answer:
The water must reach 100 degrees Celsius in order for the water to start boiling. So the boiling point is an intensive property. Likewise, melting point is also an intensive property. Other examples of intensive properties include density , solubility, color, luster, freezing point and malleability.
From the equation, we see that for every 4 moles of pyrite consumed, 11 moles of oxygen are consumed.
So, the answer is (10.5/4)(11) = <u>28.875 mol</u>
Q. No. 1:
a) Endothermic
b) Exothermic
c) Endothermic
d) Exothermic
Q. No. 2:
a) Exothermic
b) Because heat is on product side (evolved to surrounding).
c)
1400 Kj = was produced by 1 mole of C₂H₄
Then,
2100 Kj = will be produced by X moles of C₂H₄
Solving for X,
X = (2100 Kj × 1 mol) ÷ 1400 Kj
X = 1.5 moles of C₂H₄
d)
3 moles of O₂ produced = 1400 Kj of Heat
Then,
1.5 moles of O₂ will produce = X Kj of Heat
Solving for X,
X = (1.5 mol × 1400 Kj) ÷3 mol
X = 700 Kj of Heat
<span>star is born when clouds of dust and elements are gathered together in a certain space due to gravity, more and more mass and therefore pressure builds. when the pressure becomes enough to overcome the electronic repulsive force between two hydrogen nuclei, they are forced together and massive amounts of energy are given off forming helium atoms. this energy is then used to fuse other nuclei together. this could be compared to the way human life starts, where instead of 2 nuclei joining together to start a life cycle, two gametes, or sex cells are joined together. </span>