21. How many calories of heat are absorbed when 50 grams of water at 100°C are completely vaporized? (Heat of vaporization = 540 cal/g)
А.590
B.5400
C. 27000
D. 54000
+

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2

Why is retrograde motion an apparent motion

Quickly what are the following of organisms that existed over a wide area but only for a limited time period called a.soft fossils b.mold fossils c.index fossils d.trace fossils