I am pretty sure astronomers use the parsec (pc) for angular measurement.
Explanation:
What is scarce is highly sought after and therefore more expensive
Answer:
The characteristics of the recent immigration from Mexico to the United States is explained below in complete details.
Explanation:
- Mexico is holding more unofficial Intermediate American immigrants at its southern boundary.
- Despite improved implementation by Mexico, many unofficial Central Americans are still transferring to the U.S. via Mexico.
- More scattered Mexicans are migrating to the U.S. now than in history.
- More Cubans are also progressing through Mexico to arrive in the U.S.
- More numerous Mexicans now say experience is about the equivalent in the U.S. and Mexico.
Answer:
- 484 KJ/mol
Explanation:
The reaction equation is;
CH4(g) + F2 (g) ------> CH3F(g) + HF(g)
The enthalpy of the reaction can be calculated from bond energies using the formula;
ΔHreaction = Bond energy of reactants - bond energy of products
or
ΔHreaction = Bonds broken - bonds formed
[4(413) + 1(155) - 3(413) + 1(485) + 1(567)]
[(1652 + 155) - (1239 + 485 + 567)]
[1807 - 2291]
= - 484 KJ/mol
