3 .What is the resulting volume if the temperature is adjusted to 320K provided that the pressure remains constant?
2. A tank ( not rigid) contains 2.5 litres of helium gas at 280C . At constant pressure, what will
be the volume of the tank after heating it and its content to 430C temperature?
What is the ionic strength of a solution composed
of O.M NaCl and 0.2M Na,SO,?
1. What concentration of NaF do you need to add to a 0.15 M HF solution to get a buffer solution pH of 9.5? The Ka for HF is 7.4x10-4.
A student measured 25ml of 0 2M hydrochloric acid into a conical flask and titrated with with sodium hydroxide.It was found that 15ml of the sodium hydroxide was needed to neutralise the acid.(a)write a balanced chemical equation for the reaction.(b)calculate the concentration of the sodium hydroxide solution.(c)calculate the ph of HCl when the concentration of the acid is 1.4×10^-5M.
6.4 oz of ZnO is 54% Zn. How many grams of ZnO does it contain?
Considering only ions with charges of +1, +2, -1, and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with Kr.
Calculate the volume of 0.25 of H2SO4 that will contain a 4.5g of the acid
10cm² of carbon (ii)oxide is sparked with 10cm² of oxygen. if all the volume of gases are measured at STP, calculate the volume of the residual gases after sparking