General Chemistry Answers

1.     If some volatile impurities are not burnt off during the first experiment, but gets burned off in the second experiment, will the reported percentage mass of water in hydrated salt be higher or lower than the true value. Explain

If 50 g of aluminum nitrite is reacted with 50g of ammonium chloride, how many grams of aluminum chloride will be produced?

With an equation of Al(NO)3+3NH4Cl=AlCl3+3N2+6H2O How many molecules of nitrogen will be formed if 100g of aluminum nitrite is used in the reaction?

. How many grams of calcium chloride are needed to prepare 72 g of silver chloride according to the following equation?

СаСl2 + AgNO3 → Са(NО3)2 + AgСl

What mass of solid magnesium (in g) would be required to react completely with 250mL of 0.200mol/L solution of hydrochloric acid?

1. Write the half-reactions occurring at the anode and the cathode for the following reactions in a voltaic cell and calculate the standard cell voltage. a. Pb_(s)+2Ag⁺_(aq)->Pb²⁺_(aq)+2Ag_(s) b. MnO_2(aq)+4H⁺_(aq)+2I^-_(aq)->Mn²⁺_(aq)+2H₂O_(l)+I_2(s)
2. Write the cell notation for (a) and (b) in #1.
3. Is the reaction below spontaneous? Prove your answer by showing equations. I_2(s)+2Br^-_(aq)->2I^-_(aq)+Br_2(l)

A 6.6 x 10^-6 M solution of nitric acid

190mL

m

L

 of a 45.7 %

%

 (m/v

m

/

v

) LiNO

3

L

i

N

O

3

 solution