Question

on a lab report, im asked to calculate the observed percent composition of copper oxide given to determine which copper it is (cu20 or cu0)...I got 0.166g of unknown copper, and i dont know how to proceed from there

Answer 1

did you weight the copper before it combined with oxygen as well?

Answer 2

no, i just weighted the mass of the beaker and the mass of the copper (65.063g and 0.166g respectively)

Answer 3

so you've only measure the copper once?
is there some way you can tell how much oxygen reacted?

Answer 4

im not sure :-( this is where im stuck

Answer 5

so, you took some copper, put it in a beaker , heated it, and then weighed it,
are you sure you weren't meant to measure it before the reaction occurred?

Answer 6

i think yo need two measurements of the copper (before heating and after heating) to compare

Answer 7

yeah makes sense

Answer 8

The procedure says weight out between 0.15g and 0.20g of the copper oxide that you are given, then record the weight and unknown #

Answer 9

so 0.166 [g] was the mass of the copper before it reacted

Answer 10

did you weight the sample after it reacted?

Answer 11

is 65.063 [g] the mass of the reacted copper in the beaker?

do you know how heavy the beaker was originally ?

Answer 12

i dont so i dont think i can calculate this

Answer 13

i will have to email my lab partner to get all the data

Answer 14

ok, yeah you can't work this out without all the data

Answer 15

thanks for helping though