Answer:
Explanation:
Chlorine gas available = 27 lbs =
Amount of water used each day = 750000 gal =
Rate at which chlorine gas used = 2.6 mg/L
Chlorine gas used
Residual content of chlorine =
Concentration of the residual chlorine is given by
Concentration of the residual chlorine is .
Answer:
Cr(OH)3
Explanation:
The addition of 6M sodium hydroxide to a solution that contains chromium(III) ion leads to the net ionic reaction;
3 OH^-(aq) + Cr^3+(aq) -------> Cr(OH)3(s)
Cr(OH)3 is insoluble except an excess of the hydroxide is added then the precipitate dissolves as follows;
Cr^3+(aq) + 4OH^-(aq)------> [Cr(OH)4]^-
Some measure of examining information
Look on page 293 of your textbooks to fact check.The symbol for an alpha particle is 4/2 He.The super- script (4) is the mass number (the sum of the numbers of protons and neutrons).The subscript (2) is the atomic number (the number of protons).
Therefore the answer should be: Super-script 4 is the mass number, Subscript 2 is the atomic number
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