Chemistry Answers

a sample of a gas taken at STP was analyzed and found to have a volume of 6.3L.The gas was taken place to a chamber where the pressure is increased by 50% while decreasing the temperature by 25% with respect to its original condition. calculate the volume increase/decrease of the gas

Which of the following assertions are CORRECT? (i) HCl(g) is not an Arrhenius acid but HCl(aq) is. (ii) NH3 is a Bronsted and Lowry base as well as Lewis base. (iii) H2O(l) can be a Bronsted and Lowry base but never a Bronsted and Lowry acid. (iv) Electron deficient molecules are Lewis acids.

On analysis a 0.500 g sample of aluminium chloride is found to contain 0.101 g of aluminium. Determine the emperical formula of aluminium chloride

A box of miniature cars contains 5 red cars, 7 blue cars, and 6 black cars. Two cars are drawn, but the first car drawn is not replaced. What is the probability of getting a red car on the first draw and a blue car on the second draw?

Write a paragraph explaining the atomic theory

Reaction between solid phosphorous, P4 and oxygen gas, produces P3O6 and 1640.1kJ of heat.

How do we calculate the mass of 300 atoms of Iron(Fe)

The decomposition of Nitrogen dioxide into Nitric oxide and oxygen is an example

of a second-order reaction. It has a rate constant of 0.54 M-1s-1 at 300 Celsius.

(a) If the initial concentration of NO2 is 0.00800 M, what is the concentration of NO2 after

20.0 minutes? 

(b) If the initial concentration of NO2 is 0.00800 M, what is the half-life?

What mass of ZnCl2 can be prepared from the reaction of 3.27 grams of zinc with 3.30 grams of HCl

How many grams of NaBr (molar mass = 102.9 g/mol) would be needed to prepare 700 ml of 0.230 M NaBr solution?