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How much energy does it take to melt 45.0g of copper at 22.50 degrees celsius? How many milliliters of 0.145 M HCl are needed to completely neutralize 45.0 mL of 0.100 M Ba(OH)2 solution? A car enters the freeway with a speed of 7.2 m/s and accelerates uniformly for 3.0 km in 2.8 min. How fast is the car moving? Answer in m/s? Let f(t) be the position (meters) of an object at time t (seconds). Let = f′(t)=V(t). Then V′(t) is the- at t.? How many grams of FD&C Green 3 (809 g/mol) are required to prepare 100.0 mL of a solution of this concentration?