Question

anyone think they can help me? I know its a bit chem and math

Answer 1

which one do u need help with

Answer 2

2 and 3

Answer 3

what is the chemical composition of Mag Bicarbonate

Answer 4

looks like its Mg(HCO3)2, is this correct?

Answer 5

Yeah but I got 26% for oxygen and I don't think that is right

Answer 6

okay lets see soo
146.34 g/mol
and there are are 6 oxygen thingies here
so thats 6*16 = 96
96/146.34 = % of oxygen

Answer 7

Oh It's 66% I see what I did wrong

Answer 8

ya it looks more liek 2/3 or 66%

Answer 9

For number 2 I got completely lost

Answer 10

But for the rest can u just check if u got it right

Answer 11

What is the chemical composition of Hyd peroxide?

Answer 12

asking chemistry and physics question problems in math is never a problem really.. if you just supply as much background information as u know about stuff like chemical compounds and their mol mass and stuff

Answer 13

just something to keep in mind, ull get help fast then (:

Answer 14

The pecent

Answer 15

Yeah I know lol but no one is ever helping in Chem and physical I posted in there for about an hour

Answer 16

looks like Hydrogen peroxide is H2O2
that is 2*1 + 2*16= 34 g/mol

Answer 17

what percentage of this total g/mol is oxygen?

Answer 18

can you find that out for me pls

Answer 19

I think this question is asking for just garns so I think this is good for #2

Answer 20

yes we will get to that.. for now just tell me what percentage of the weight is oxygen in
h2O2

Answer 21

Okay give me a sec

Answer 22

Oxygen equal 94% and h equal 6%

Answer 23

okay so 94% of the total weight is oxygen

Answer 24

94% of 57 =

Answer 25

54

Answer 26

94% means 94/100 or 94 parts out of 100 parts
split 57 into 100 parts and take 94 of them

57/100 = 0.57 for each part

94*0.57 = taking 94 of the 100 parts of 57

Answer 27

okay yep ur done

Answer 28

so number 2 would be 57garms right?

Answer 29

no 54

Answer 30

Oh my bad mistyped

Answer 31

mass of O2
----------- * 57 grams = 54 grams
mass of H2O2

to summarize what we did here

Answer 32

Also if u don't mind couldn't u check the other for me I did it already

Answer 33

ahh thats a lotta work for me i gotta look up all the compounds, is there anything u are confused about

Answer 34

how would you set this problem up how many atoms are in 7.2 grams of copper

Answer 35

okay so how many atoms are in 1 mol

Answer 36

64g

Answer 37

?i am preety sure its 64

Answer 38

thats the molar mass 64 g/mol for CU

Answer 39

we want to know the number of atoms in a mol

Answer 40

a mol is basically a certain number of atoms... so when you see those numbesr on the period table, those are telling u the mass for a certain number of atoms of that element

Answer 41

6.02?

Answer 42

a lot more than that xD

Answer 43

29?

Answer 44

it should be 6.02*10^23 = 602000000000000000000000000..

Answer 45

oh

Answer 46

how did u get that number?

Answer 47

look up how many atoms are in a mol

Answer 48

oh i see it