How do you separate the pure ethanol from the mixture of coloured aqueous solution with ethanol​

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?