The zone in north africa/southwest asia known for its once-plentiful fresh water, open grasslands, and abundant wild grains is called <span>Fertile Crescent.
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The answer
the speed of <span>the train traveling in kilometers per minute can be found by using the following method:
v = </span><span>30 miles per hour
</span><span>1 mile = 1.6 kilometers
just do the calculus by changing miles to kilometers
</span>1 mile = 1.6 kilometers, so 30 miles= 1.6 km x 30 = 48 km
so the speed of the train is
v=30 miles / hour = 48km / h = 48km / 60 mn = 0.8 km/ mn
the answer is
<span>C- 0.8 km/min</span>
1) HFC-134a is 1,1,1,2-tetrafluoroethane, with molecular formula C₂H₂F₄.
M(C₂H₂F₄) = 2Ar(C) + 2Ar(H) + 4Ar(F) · g/mol.
M(C₂H₂F₄) = 2 · 12 + 2 · 1.01 + 4 · 19 · g/mol.
M(C₂H₂F₄) = 102.02 g/mol; molar mass of HFC-134a.
2) 1) HCFC-124 is 1-chloro-1,2,2,2-tetrafluoroethane, with molecular formula C₂HClF₄.
M(C₂HClF₄) = 2Ar(C) + Ar(H) + Ar(Cl) + 4Ar(F) · g/mol.
M(C₂HClF₄) = 2 · 12 + 1.01 + 35.45 + 4 · 19 · g/mol.
M(C₂HClF₄) = 136.46 g/mol; molar mass of HCFC-124.
