Chemistry Answers

A 20.0-L volume of methane gas is heated from 25°C to 70°C at constant pressure. What is the final volume of the gas?

A 20.0-L volume of methane gas is heated from 25°C to 70°C at constant pressure. What is the final volume of the gas?

Balance the following reactions by half-reaction method. Identify the oxidizing agent and the reducing agent. Show your process in balancing the reactions.

Ag + I^- + Sn⁴⁺       AgI + Sn²⁺   

Ti³⁺ + Fe(CN)₆^3-       TiO²⁺ + Fe(CN)₆^4- 

HNO₂ + MnO₄^-       NO₃^- + Mn²⁺  

5. A balloon has a volume of 2.25 L when the temperature is 40 degree celsius. What will be the volume if the balloon is cooled to 12 degree celsius? Assume the pressure to be constant.

4. A 2.5 litre sample of a gas is heated from 25 degree celsius to 55 degree celsius at constant pressure. Compute the volume at the higher temperature?

3.At 25⁰C, the volume of chlorine gas is 15 dm³ .What is the resulting volume if the temperature is adjusted to 320K provided that the pressure remains constant?

(b) The cell reaction for a galvanic cell is given below Cu(s)+2Ag^(+)(aq)rarr Cu^(2+)(aq)+2Ag(s) (i) Write the half-cell reactions at the anode and the cathode (ii) Calculate the value of cell emf under standard conditions; use data from Table 7.1 (iii) Will the reaction be spontaneous as written?

Aluminum oxide has a composition of 52.9% aluminum and 47.1% oxygen by mass. If 16.4g of aluminum reacts with oxygen to form aluminum oxide, what mass of oxygen reacts?

The chloride in a sample containing approxiamately 3.5% NaCl is to be determined

gravimetrically as AgCl. What weight of sample must be taken to obtain a precipitate

that will weigh about 0.10 g?

A certain concentration works best when the analyte’s concentration is approximately 10ppb.

B. If the analyte is present at 10% w/v, how would you prepare the sample for analysis