chemistry benchmark 2/26/2014

5.Calculate the number of moles of 308g BaSO4. (ch 7)

1.32 mol BaSO^4

1.Calculate the number of SO2¬ molecules in 1.28 moles of SO2 (ch 7)

7.71 x 10^23 molecule of SO^2

2.How many moles of Fe are in 5.22 x 1022 atoms of Fe? (ch 7)

0.087 mols or 8.67 x 10^-2 mols

6.How many molecules of CaCO3 are contained in an antacid tablet containing 0.311g of CaCO3? (ch 7)

1.87 x 10^21 or 1.87^21

3.Calculate the molar mass of Al2(SO4)3. (ch 7)

324.14 g

12. Using the reaction given in the previous problem, given 5.50 moles of SO2, how many moles of SO3 will be produced? (ch 9)

5.5 mol SO^3 produced

8.Calculate the empirical formula of a compound containing 51.7% C, 6.95% H, and 41.3% O. (ch 7)

C^5H^8O^3

10.The carbohydrate fructose found in honey and fruit has an empirical formula of CH2O. If the experimental molar mass of fructose is 180g, what is its molecular formula? (ch 7)

C^6H^12O^6

9.An organic acid contains 57.14% C, 4.80% H, and 38.06% O and has an experimental molar mass of 168g. What is the molecular formula of this compound? (ch 7)

C^8H^8O^4

11. 2 SO2 (g) + O2 (g) 2 SO3 (g) What is the ratio of moles of SO3 to moles of SO2 ? (ch 9)

2 mol SO^2/2 mol SO^3

4.Calculate the mass, in grams, in 0.150 mol of Na2O. (ch 7)

9.3g of Na^2O