A sample of lithium sulfate, Li2SO4, has 2.94 x 1023 atoms of lithium. How many moles of lithium sulfate is the sample?
a
0.0698 mol Li2SO4
b 0.244 mol Li2SO4
0.488 mol Li2SO4
d 0.977 mol Li2SO4
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If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.