Chemistry

posted by .

Very confused!
Converting between grams of a compound and grams of a constituent element

Determine the mass of oxygen in a 5.8 g of NaHCO3
5.8 g NaCHO3 * 1 mol NaCHO3/ 84.01 NaCHO3 * 48.00 mol O / 1 mol NaCHO3 * 16.00 g O/ 1 mol = I got 53 but the answer is 3.3 g O
Help what am I doing wrong

• Chemistry -

I will do it in steps and you can put it all together if you wish.
5.8 g/84.01 = moles NaHCO3.
There are 3 atoms O per 1 mole NaHCO3; therefore, moles NaHCO3 x 3 = moles O atoms.
Then moles O atoms x 16 g/mol = g O atoms. 3.3g is correct.

• Chemistry -

Ok what I did wrong was say 48 O atoms instead of just 3. Thank you very much

Similar Questions

1. chemistry

unknown element X combines with oxygen to form the compund XO2. If 44.0 grams of element X combines with 8.00 grams of oxygen, what is the atomic mass of element X?
2. Chemistry

1)The chemical formula for aspirin is C9H8O4. What is the mass of 0.40 mol of aspirin?
3. Chemistry

Assume that a reaction occurs in which unknown substances R and S react to form unknown substances T and U. From the information below, determine the mass of substance T that will be formed if 45.0 grams of substance R reacts with …
4. Chemistry

A particular metallic element, M, has a heat capacity of 0.36 J*g*K, and it forms an oxide that contains 2.90 grams of M per gram of oxygen. (a) Using the law of Dulong and Petit (Cp x M = 25 J*mol*K), estimate the molar mass of the …
5. Chemistry

A particular metallic element, M, has a heat capacity of 0.36 J*g*K, and it forms an oxide that contains 2.90 grams of M per gram of oxygen. (a) Using the law of Dulong and Petit (Cp x M = 25 J*mol*K), estimate the molar mass of the …
6. chemistry

A solution was made by dissolving 62.07 grams of a compound in 500.0 g of water. The compound was not ionic. The freezing point of the solution was measured and found to be – 1.86oC. Using the Kf value in your textbook , the molar …
7. chemistry

A solution was made by dissolving 62.07 grams of a compound in 500.0 g of water. The compound was not ionic. The freezing point of the solution was measured and found to be – 1.86oC. Using the Kf value in your textbook , the molar …
8. chem

the combustion of 1.83 grams of a compound which only contains C,H, and O yields 4.88 grams of CO2, and 1.83 grams of H2O. What is the empirical formula of this compound?
9. Chemistry

what is the percent by mass of NaCHO3 in a solution containing 12g NaCHO3, dissolved in 450mL of water?
10. chemistry

If 15.0 grams of C3H6, 10.0 grams of oxygen, and 5.00 grams of NH3 are reacted, what mass of acrylonitrile can be produced assuming 100% yield, what mass of the excess reactants remain?

More Similar Questions