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1. What is the empirical formula of a compound composed of 3.25% hydrogen (H), 19.36% carbon (C), and 77.39% oxygen (O) by mass? 2. A compound with the empirical formula CH2 has a molar mass of 84 g/mol. What is the molecular formula for this compound? 3. A 15.85 g sample of Mo2O3(s) is converted completely to another molybdenum oxide by adding oxygen. The new oxide has a mass of 16.91 g. Add subscripts below to correctly identify the empirical formula of the new oxide. 4. A 7.99 g sample of a compound contains 2.55 g potassium (K), 2.31 g chlorine (Cl), and oxygen (O). Calculate the empirical formula. 5. A compound is 54.53% C, 9.15% H, and 36.32% O by mass. What is its empirical formula? 6. The molecular mass of the compound is 132 amu. What is the molecular formula? 7. How many grams of a 14.0% sugar solution contain 38.5 g of sugar? 8. You need to dissolve CaCl2 in water to make a mixture that is 33.0% calcium chloride by mass. If the total mass of the mixture is 741.4 g, what masses of CaCl2 and water should be used? ( Mass of CaCl2) ( Mass of H20) 9. A solution contains 4.40 g of solute in 11.6 g of solvent. What is the mass percent of the solute in the solution? 10. A 4.68 g sample of a laboratory solution contains 1.32 g of acid. What is the concentration of the solution as a mass percentage? 11. How many moles of NaOH are present in 19.0 mL of 0.280 M NaOH? 12. Calculate the number of moles of solute in 93.83 mL of 0.1595 M K2Cr2O7(aq). 13. The mass percentage of hydrochloric acid within a solution is 40.00%. Given that the density of this solution is 1.200 g/mL, find the molarity of the solution. 14. How many grams of solute are present in 835 mL of 0.710 M KBr? 15. calculate the molarity a) 21.7 g of NaCl in 799 mL of solution. = in (M) b) 0.500 mol of NaOH in 1.40 L of solution.= in (M) 16. Calculate the molarity a) 0.250 mol of Na2S in 1.80 L of solution. b) 34.7 g of MgS in 911 mL of solution. 17.How many milliliters of 12.0 M HCl(aq) are needed to prepare 915.0 mL of 1.00 M HCl(aq)? 18. What is the concentration of a solution made by diluting 35 mL of 6.0 M HCl to a final volume of 750 mL?
The addition of H2 to double bonds is an important reaction used in the preparation of margarine from vegetable oils. If 50.0 mL of H2 and 50.0 mL of ethylene (C2H4)are allowed to react at 1.5 atm, the product ethane (C2H6) has a volume of 50.0 mL..
If a bottle of nail polish remover contains 151 g of acetone, how much heat would be released by its complete combustion?
Explain the valences for each, showing what may happen to the electronic structure in each case
A gaseous mixture of O2 and Kr has a density of 1.111 g/L at 420. torr and 300. K. What is the mole percent O2 in the mixture?
Isotope 1 has a mass of 120.9038 amu and a relative abundance of 57.4%, and isotope 2 has a mass of 122.9041 amu. What is the atomic mass of this element?
determine the freezing point depression, delta Tf, for the ionic solution. b. determine m effective for ionic solution. c. determine the van't Hoff factor, i, for the ionic compound.
Heat Capacity explained in this answer, Given the following heat capacity data for 2-propanol, determine the amount of heat required to heat 500 mL of 2-propanol from 0 C to it's boiling point.
Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3 NO2(g) + H2O(l) -→ 2 HNO3(l) + NO(g) If 927 L of NO2 gas react with water, what volume of NO gas will be produced? Assume the gases are measured under the same c..
calculate that how many liters of carbon monoxide gas, measured under the same conditions, is essential?
A laser pulse with wavelength 555nm contains 4.40mJ of energy. How many photons are in the laser pulse.
what mass of magnesium will react wait a 500.0mL container of oxygen at 150.0 degrees Celsius at 70.0 kPa?
explain Why this separation occur and which solvent will be on top - the temperature of twenty degree Celsius. When hexane is added with H 2 O, there is a separation
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