It has been estimated that there is 4.00 × 10-4 mg of gold per liter of seawater. At price of $19.40/g, what would be the value of the gold in 7.41 km3 (1 km3 = 1 × 1015 cm3) of the ocean?

A chemist prepares a solution of vanadium III  bromide    VBr3    by measuring out  69.8mg  of  VBr3  into a  250.mL  volumetric flask and filling to the mark with distilled water.   Calculate the molarity of Br−  anions in the chemist's solution.   Be sure your answer is rounded to the correct number of significant digits.

A chemist prepares a solution of mercury (I) chloride (Hg₂Cl₂) by measuring out 1.96 mg of mercury(I) chloride into a 500. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's mercury(I) chloride solution. Be sure your answer has the correct number of significant digits. mol/L x10 X S

A chemist prepares a solution of magnesium fluoride (MgF₂) by measuring out 0.00648 µmol of magnesium fluoride into a 500. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in µmol/L of the chemist's magnesium fluoride solution. Round your answer to 3 significant digits. μ mol L x10 X Ś

A chemist prepares a solution of aluminum sulfite = (Al2(SO3)3) by measuring out 56.8 µmol of aluminum sulfite into a 100. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's aluminum sulfite solution. Be sure your answer has the correct number of significant digits. 6 mol 0 × 10 X L C X

(2.23 x 10^3 g) (9.0 x 10^-3 g)/ 10.1 x 10^-7 s^2=

2

If 0.42 mg calcium fluoride, CaF2 is used as above to add fuoride to the drinking water, doesCaFz add more fluoride than 0.42 g of NaF in the 250 mL glass of water? Justify your answer.

A chemist prepares a solution of iron II bromide   FeBr2   by measuring out 17.mg of FeBr2 into a 50.mL volumetric flask and filling to the mark with distilled water.   Calculate the molarity of Br− anions in the chemist's solution.   Be sure your answer is rounded to the correct number of significant digits.

A chemistry student weighs out 0.0598 g of acrylic acid (HCH₂CHCO₂) into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1700 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Round your answer to 3 significant digits. mL x10 X Ś