alright, if anyone on here finds it in their heart to help me with these two chemistry extra credit problems, it would be greatly appreciated. i have a D in the class right now, and i need the points. any help would leave me eternally grateful.
1.from the information below, determine the mass of substance C that will be formed if 45 grams of substance A reacts with 23 grams of substance B. assume that the reaction between A and B goes to completion.
substance A is a grey solid that consists of and alkaline earth metal and carbon(37.5% by mass. it reacts with substance B to form substances C and D. Forty million trillion formula units of A have a mass of 4.26 milligrams
47.9 grams of substance B contains 5.36 grams of hydrogen and 42.5 grams of oxygen
when 10 grams of substance C is burned in excess oxygen, 33.8 grams of carbon dioxide and 6.42 grams of water are produced
substance D is a hydroxide of the metal in substance A
2.A naturally occurring pigment contains only carbon, hydrogen, and oxygen. It was commonly used as a dye in the first half of the nineteenth century. it is 53.66% C and 4.09% H by mass. a titration requires 18.02 mL of .0406 M NaOH to .3602 grams of the pigment. assuming one acidic hydrogen per molecule, what it the molecular formula of this pigment?
you are going to need the specific known values for molecular weight, etc. from the tables in the appendix of your textbook. do you guys use the book written by zumdahl? also, those are called marathon problems for a reason. they have a ton of steps with lots of busy work, math, and basically you will need to look through your periodic table for the elements that have the same weights and whatnot as the value you find with your calculations. we could probably still get them right, but the surefire way is to have the same source material as you, because the values differ slightly in each publication.
holy shit, i cant remember any of that stuff, damn...im only a sophomore in AP bio, i did titration whatever last year aaaahhhh...im sure if i had time id work it out but wow...its missing little bits and pieces of info that i cant figure out how to find
in the 5th grade i asked a girl out and then ran away as fast as i could, it was awesome. - winndeburlo
i would love you, but i have to have work that explains my answers as well. the answers will definitely help and now i think i have a general direction in which to go.
this isn't due until the 16th, too, so i still have some time.
you need to use the atomic mass with the percentages and that is all i know. and alkalai earth metals are like group 2 or sumthing
hey, get off my sack
"maybe we should give the hurricanes black names. that way they are lazy and dont bother fucking anything up.
or give them mexican names so they hang around parking lots and then instead of fucking everyone up, they build decks and houses." -Timmi