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A) What is the molarity of C6H12O6 in an aqueous solution that is prepared by dissolving a 20.95 g sample of impure C6H12O6 in water to make 1,450 mL of solution. Assume that the sample is 93% C6H12O6 by mass. Enter your answer in mol/L, accurate to three significant figures
B) An aqueous stock solution is 28.0% NH3 by mass and its density is 0.9 g/mL. What volume of this solution is required to make 1.50 L of 2.75 mol/L NH3(aq)? Give your answer in millilitres, accurate to three significant figures.
C) What is the minimum volume of 2.85 mol/L HCl(aq) required to dissolve 12.1 g Zn metal? The atomic weight of Zn is 65.39 g/mol. The unbalanced chemical equation for the reaction isZn(s) + HCl(aq) --> ZnCl2(aq) + H2(g)Enter your answer accurate to three significant figures
D) What volume of 2.09 mol/L H2SO4(aq) is required to completely neutralize 40.5 mL of 1.47 mol/L KOH(aq) ?Give your answer in mL, accurate to three significant figures
E) A 5.645-g sample of a mixture of Fe and Al is treated with excess HCl(aq). If 0.2122 moles of H2 are obtained, then what is the percentage by mass of Fe in the original mixture? Give your answer accurate to three significant figures
Consider a molecule having three energy levels as follows: State Energy (cm?1) degeneracy 1 0 1 2 500. 3 3 1500. 5 Imagine a collection of N molecules
What is the limiting reactant when 4.5 moles of aluminum react with 6.7 moles of oxygen gas?
An archeologist finds a huge monolith in the desert. In order to estimate the weight of this object; he estimates the dimensions of the monolith and removes some chips from the rock with his hammer.
If the metal crystallizes in a body-centered cubic structure, which choice is closest to the atomic mass?
An aqueous solution is 22.0% by mass silver nitrate, AgNO3, and has a density of 1.22 g/mL. What is the molarity of silver nitrate in the solution?
For the next three problems, consider 1.0 L of a solution which is 0.3 M HC2H3O2 and 0.2 M NaC2H3O2 (Ka for HC2H3O2 = 1.8 x 10-5). Assume 2 significant figures in all of the given concentrations so that you should calculate all of the following pH..
The NaHCO3 is the limiting reactant and the HCl is the excess reactant in this experiment. Determine the theoretical yield of the NaCl product.
Propose a mechanism to account for the formation of a cyclic acetal from 4-hydroxypentanal and one equivalent of methanol
Identify the two important classes of catalysts. Analyze the chemical reactions that take place when a biological catalyst combines with a reactant (substrate) to form an unstable intermediate.
What is the molarity of the prepared naoh solution as determined in the titration? How many moles of OH are present when the end point is reached? What color should the solution appear at end point?
Using the van der Waal constants for methane in table 1.3 (a=2.283, b=0.04278) to calculate the initial slopes of the plots of the compressibility factor
The electron is passed down an electron-transport chain, at the end of which NADP+ is reduced. The reduction potentials of P700+, A and NADP+ at pH7 and 25 oC are 0.490V, -0.900V, and -0.350V respectively.
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