General Chemistry Answers

Xylene, an organic compound that is a major component of many gasoline blends, contains carbon and hydrogen only. Complete combustion of a 17.12 mg sample of xylene in oxygen yielded 56.77 mg of CO2 and 14.53 mg of H2O. Determine the empirical and molecular formula of xylene. Molecular weight of xylene is 106.16 g/mol

What is the percent composition of silicon nitride (Si3N4)?

If a USB drive cost $24.00 for 4 USB’s how many USB drives can you buy for $36

A copper/silver electrochemical cell is set up - Cu | Cu²⁺ Ag⁺ | Ag

Using the following values, calculate the potential difference that is expected.

Standard electrode potential of Cu | Cu²⁺ = +0.34V

Standard electrode potential of Ag⁺ | Ag = +0.80V

Explain why the measured potential difference may not be precisely that predicted

what is the mole ratio of NO to O2?

1. How would you prepare a 1.8% NaBr (w:v) aqueous solution?

2. In a biochemical assay, a chemist needs to add 2.93 g of glucose to a reaction mixture. Calculate the volume in mL of a 1.35M glucose solution she should use for the addition.

3. The concentrated sulfuric acid we use in the laboratory is 98.0 percent H₂SO₄ by mass. Calculate the molality and molarity of the acid solution. The density of the solution is 1.83g/mL

If sodium hydroxide reacts with sulfuric acid write an equation to show why you will need 2 mol of NaOH for 1 mol of H2SO4

An ideal gas is in a container at a pressure of 725 mmHg and a temperature of 32 degrees celcius. Determine the concentration of the gas in ithe container in mol/L.

Write a balanced ionic equation to represent the oxidation of iodide ion (I-) by permanganate ion (MnO-4) in basic solution to yield molecular iodine (I2) and manganese (IV) oxide (MnO2).

Use the 7 step