Chemistry Answers

If 28.1 grams of ammonium chloride react to form 8.9 grams of ammonia, how many grams of hydrogen chloride must simultaneously be formed?

GIVEN

(A) PhCHO

(B) CH2(CO2Et)2

(c) PhCOCH3

DESIGN TWO ROUTE FOR THE SYNTHESIS OF PhCOCH2CH(Ph)CH(CO2Et).

(1)EACH OF THE ROUTE SHOULD GO THROUGH THE MICHAEL ADDITION REACTION.

(2) COMMENT ON THE SUITABILITY OF EACH ROUTE.

a solution of gold (3) trioxonitrate (5) is electrolysed using a current of 25mA until 1.2g of gold is deposited at the cathode . what is the amount of electricity that would have passsed through the solution. and how long will it take for such an amount of gold to be deposited. then calculate the volume of the gas liberated at the anode.

11. Describe how you would prepare 465 mL of 0.3550 M

potassium dichromate solution starting with

(b) 0.750 M potassium dichromate solution

What is the maximum amount in moles of P

2

O

5

P2O5 that can theoretically be made from 112 g

g of O

2

O2 and excess phosphorus?

A 10.00 mL sample of ethanol is added to 250.0 mL of water in order to observe the freezing point depression of the water. Consider the possible errors in this experiment, and determine whether each would cause the freezing point of the water to increase, decrease, or remain the same compared with the expected results

The freezing point depression constant, K_f, for camphor is very large, 37.7 ⁰C•kg/mol, making camphor a useful solvent to determine the mass of larger molecules, such as peptides. 122.5 mg of a peptide dissolved in 1.50 g of camphor gives a freezing point depression (ΔT_f) of 1.13 ⁰C. What is the molecular mass of the protein?

human blood typically contains 1.04 kg/l of platelets. a 1.35 pints of blood would contain what mass (in grams)? 

Propane (C₃H₈) burns in oxygen to produce carbon dioxide gas and water vapor. (a) Write a balanced equation for this reaction. (b) Calculate the number of liters of carbon dioxide measured at STP that could be produced from 7.45 g of propane.

What would be the quantity of zinc oxide if u are to prepare 200ml