Kenry

6.10g of boron reacted completely with 22.9g of chlorine to give 29.0g of the metallic chloride. Calculate the empirical formula of the chloride.

20cm(cube) of a gaseous hydrocarbon were mixed with 90cm(cube) oxygen, and the mixture exploded. At room temperature, 60cm(cube) of gas were left. 40cm(cube) of the gas(cabon(4)oxide) were absorbed by sodium hydroxide, leaving 20cm(cube) of oxygen. find t...

the rate constant for the first order reaction decomposition of N2O5 at temperature t°C is 2.2×10^-1. if the initial concentration of N2O5 is 3.6 ×10^-3 mol/dm^3. what will be the concentration after four halve-lives?

How many 20 Ω resistors must be connected in series to give an equivalent resistance to five 200 Ω resistors connected in parallel?

Thanks Boss