General Chemistry Answers

Pb(NO₃)₂ + 2 NaI = PbI₂ + 2 NaNO₃

How many moles of lead (II) nitrate are needed to react completely with 10 moles of sodium iodide?

 How will you compare it with the heat needed by alcohol with molar heat of vaporization 44.0 kJ at 35.0 g and boils at 82.5°C? Note that the molar mass of isopropyl alcohol is 60.1 g/mol.

1) A 1.0 g of protein hemoglobin is dissolved in enough water to make 200 mL of solution. The osmotic pressure of the solution is measured at 25 0C and found to be 1.35 mmHg. What is the molecular weight of the hemoglobin?

2) What is the osmotic pressure of a solution made up of 15 g of salt, NaCl, in 250 mL of solution at 27 0C?

Pb(NO₃)₂ + 2 NaI à PbI₂ + 2 NaNO₃  

7)   How many grams of the product were formed in no. 6 if the percent yield is 80%?

Pb(NO₃)₂ + 2 NaI à PbI₂ + 2 NaNO₃

6)   Suppose in the reaction in which 100 grams of lead(II) nitrate were all used up and only 100 grams of lead(II)iodide were obtained in the experiment, what is the percent yield?

Pb(NO₃)₂ + 2 NaI à PbI₂ + 2 NaNO₃

4)   If 100 grams of lead (II) nitrate and 100 grams of sodium iodide were initially used in the reaction, which is the limiting reactant? Which is the excess reactant?

5)   Find the amount excess in grams in #4

Pb(NO₃)₂ + 2 NaI à PbI₂ + 2 NaNO₃ 

4)   If 100 grams of lead (II) nitrate and 100 grams of sodium iodide were initially used in the reaction, which is the limiting reactant? Which is the excess reactant?

Pb(NO₃)₂ + 2 NaI = PbI₂ + 2 NaNO₃  

2)   How many moles of lead (II) iodide were produced when 5 moles of lead (II)nitrate were used in the reaction?

Pb(NO₃)₂ + 2 NaI à PbI₂ + 2 NaNO₃                                  

1)     How many moles of lead (II) nitrate are needed to react completely with 10 moles of sodium iodide?

How many drops of liquid can a 1-peso coin hold for water, ethyl alcohol and acetone?