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What volume of 5.0M stock solution of Na2SO4 is needed to make 250.0 mL of a .75M solution of Na2SO4? What is the name of molecule? Solve the equation sin(2x)cos(x)+cos^2(x)=0? Please get me the solution of the first question. The correct answer is (d) 43.2 N ( Question pic included)? Do you consider 3 years to be a long time?