1) 4.20 x10^6 ml + 12.3 x 10^2 L= My answer is 4.21 x 10^9

Question

2) Change 17.7 L to cubic meters? My answer 1.77 x 10^3



3) Draw an electron dot diagram for K3PO3

My answer K

O P O

O

I couldn't do the dots but there should be 26 dots right?



4) A 35.0 g sample of a carbon-oxygen compound is 72.7% oxygen, 15.0 % hydrogen, and the rest is carbon. How many grams of carbon are there in 12.2 g sample of the compound?

My answer 12.2g x .727= 8.86 g



5) write in scientific notation show the correct # of sig figs?

602,000,000,000,000,000,000,000

My answer 6.02 x 10^23 or x10^21



any help would be greatly appreciated. I just want to make sure I am getting my answers right

Answer 1

1 and 2 are incorrect.
3 I can't draw on the boards.
4 is incorrect. You calculated oxygen but the problem asked for carbon.
5. 5 is correct if you use x 10^23 (not x 10^21).

Answer 2

DrBob222 do you think you can help me figure these out please. On #4 would I do 12.2g x 35.0g= ??

Answer 3

No.
12.2 g x decimal equivalent of percent C.