Can you please show all working out, this is only about 20% of my question. I need the working all to be able to complete the rest.
1) What mass of solute is needed to prepare:
a) 500mL of 3.0M HCl
2) Vinegar is a solution of acetic acid (CH3COOH) in water. If 200mL of vinegar contains 8.0g of acetic acid. What is the molar concentration of acetic acid in vinegar
3) A compound has the following percentage composition by mass: 32% carbon 6.7% hydrogen 18.7% nitrogen and 42.6% oxygen
Find the empirical
8) A hydrocarbon contains 90% carbon and 10% hydrogen. Find the empirical formula.
2007-09-07 16:17:21 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Do your OWN homework and receive an education!
You can actually find a job that doesn't have a name tag attached to it.
2007-09-07 16:23:27 · answer #1 · answered by Stuart 7 · 1⤊ 0⤋
I'll help with #3, since if you know that, #8 will be a snap.
In these problems, divide each percent by the ATOMIC WEIGHT OF EACH ELEMENT respectively. For carbon, the weight is 12, for hydrogen, 1, for nitrogen 14, and oxygen 16. To find an empirical formula, you want to have the element with the smallest g-atoms equal to 1 (in this case nitrogen) and scale up or down the other elements accordingly. You will find that the others may be fractions. Leave them this way, since an empirical formula is just that- from experiment.
2007-09-07 16:32:16 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋
This is why our scientists and doctors are ******* up everything they touch these days. I don't underestimate the true capacity at which your brain is capable of performing. So do your own ******* homework! It's better for everyone this way. If you're just feeling lazy then just don't do it and tell the teacher to go shove the assignment and all the ones to follow where the sun don't dare shine. Kick chemistry to the curb and take ******* earth science. Something more suitable to your threshold for wholesome studying.
2007-09-07 16:28:20 · answer #3 · answered by allthatsolid 3 · 0⤊ 0⤋
yea, you should do it on your own so when a test comes you dont fail...and dont spam for points whoever said pie and chips...
2007-09-07 16:26:40 · answer #4 · answered by Dylan R 2 · 0⤊ 0⤋
Uh. . . . Pie and Chips !
2007-09-07 16:23:04 · answer #5 · answered by CrossTwnTraffic 6 · 1⤊ 0⤋