General Chemistry Answers

In research, it has been found that millions of bottled mineral water contain benzene (C₆H₆) at morality levels higher than concentrations considered lethal for rats. A sample of 250 mL mineral water has a concentration of 0.000151 M. What is the mass of benzene in the sample? Show your solutions

Given the following cell notation for a voltaic cell

Zn (s)  Zn2+ (0.045 M)  Cr3+ (0.800 M)  Cr (s)

a) Write the balanced half-cell and overall equations.

[3 Marks]

b) Calculate the standard cell potential, Eo cell.

[2 Marks]

c) Determine the cell potential, Ecell.

[3 Marks]

d) If the cell is allowed to operate spontaneously, will Ecell increase, decrease or remain

constant with time? Explain.

[2 Marks]

e) Determine the standard free-energy change (G) and free-energy change (G) of

the cell

the chemical reaction of

1) 2n2o(g) → 2n2(g) + o2(g)

2) n2(g)+3h2(g)→2nh3(g)

3) 2c4h10(g)+13o2(g)→8co2(g)+10h2o(g)

What is the minimum number of moles of Na₃PO₄•12H₂O that would be requried to react with 0.463 mol of BaCl₂•2H₂O? Do not include units with your answer.

How many formula units of magnesium nitrate are in 0.750 mol of Mg(NO

3

)

2

?

calculate the emf of cell at 298 k sn/sn2+ (.1m)/ag+(.1m)/ag

 You have detected a novel uncharacterized RNA which you named Rawal-RNA (It could be mRNA/tRNA/rRNA). When you treat cells with a low dose of alpha-­amanitin, levels of Rawal--RNA and GAPDH mRNA DECREASE drastically, whereas tRNA and rRNA levels are unchanged.

 a) Which RNA polymerase makes RawalRNA? 

b) Explain your reasoning

A pulse tracer is introduced in ideal CSTR with mean residence time "\\tau" .Find the time taken for exit concentration of tracer to reach half of its initial value.

40ml of x M kMnO4 solution is required to react completely with 200ml of 0.02M oxalic acid solution in acidic medium. The value of x is