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45 solutions


Q. Experiments with rats show that if rats are dosed with 3.0 mg/kg of cocaine (that is, 3.0 mg cocaine per kg of animal mass), the concentration of dopamine in their brains increases by 0.75 uM after 60 seconds. Calculate how many molecules of dopamine would be produced in a rat (average brain volume 5.00 mm^3) after 60 seconds of a 3.0 mg/kg dose of cocaine?

Solved • Aug 10, 2019


Q. Given the following information: • Concentrated perchloric acid (HClO4) stock = 70% (w/w). • % weight/weight (w/w) will mean number of ‘mass’ parts in 100 ‘mass’ parts. • Density of concentrated perchloric acid (70% (w/w)) stock = 1.664 g/mL. • Molecular mass: HClO4 = 100.46 g/mol. b) What volume of concentrated perchloric acid (HClO4) stock is required to make 200 mL of a pH 2.5 perchloric acid solution?

Solved • Aug 9, 2019


Q. You need to prepare 200 mL of a 0.4 M solution of copper sulfate (CuSO4). You have 80 mL of a 0.5 M CuSO4 solution and 100 mL of a 7.5% (w/v) CuSO4 solution. What volume of 7.5% CuSO4 and water needs to be added to the 80 mL of 0.5 M CuSO4 solution to make up 200 mL of 0.4 M CuSO4? • Molar mass of CuSO4 = 159.609 g/mol. • % (weight / volume) means mass (in g) in volume (100 mL).

Solved • Aug 8, 2019


Q. How would you prepare a 345ml of .12 M Fe(NO3)3 using the solid Fe(NO3)3 reagent?

Solved • Jul 29, 2019


Q. 46g of acetic acid are dissolved in 54g of water the solution has density of 1.12g/mol . what is the concetration

Solved • Jul 25, 2019


Q. A solution is 0.0433m LiF. What is the molarity of the solution if the density is 1.10 g/mL? A) 0.0390 M B) 0.0417 M C) 0.0441 M D) 0.0519 M E) 0.0476 M

Solved • Jul 15, 2019


Q. Aqueous solutions of 30% (by weight) hydrogen peroxide, H2O2, are used to oxidize metals or organic molecules in chemical reactions. Given that the density of the solution is 1.11 g/mL, calculate the molarity. A) 6.78 M B) 9.79 M C) 12.6 M D) 0.794 M

Solved • Jul 15, 2019