The formula is CO and the Molecular weight is 28. How many (A)grams(B) mole (C) number of molecules (D) Total number ofatoms

I got this question wrong on my homework. The teacher did notgiveus the answer nor explain to us how to do this. With thegiveninformation I don't know how to solve this.

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Jarrod RobelLv2

2 Aug 2019

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I got this question wrong on my homework. The instructor did notgoover the answer with us. Can someone please answer thisquestionfor me. Thank you.

What am I doing wrong? How can I calculate percentage of sodium percarbonate in oxiclean? I'm getting weird calculations.

Basically for my experiment, I heated 2.138 grams of oxiclean to run off the hydrogen peroxide in the sample and was left with sodium carbonate solid in my test tube.

My testtube + oxiclean is 21.304g

Then I reheated it four times and recorded the following masses until I reached a .01% difference in weight.

To find percentage of sodium percarbonate in my oxiclean, I did the following calculations....

I subtracted 21.368 (testtube + oxiclean weight before heating) from 21. 234 (last reheat weight) and got an answer of .134 g of hydrogen peroxide that left my sample when heated.

Now, using that, I began my stoichiometry

With a balanced equation of: