Arun has a solution of copper sulfate labelled X. 1. explain how he can make up a 100cm3 solution of copper sulfate that is:
a) half as concentrated as solution X
b) a quarter as concentrated as solution X
c) half as concentrated as the solution in part b
2. what steps can arun take to ensure that his solutions are made up as accurately as possible?
help ASAP

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Select the correct answer. when carbon dioxide dissolves in water, it sometimes reacts with water to form carbonic acid as in this balanced equation: co2 + h2o → h2co3. if 495 milliliters of carbon dioxide at 25°c and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid? use the periodic table and the ideal gas resource a. 0.889 g b. 1.10g c. 1.27g d. 2.02g what's the answer! quick!

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.