Practice 1. A gas sample contains two elements, C and H. A 10.0-g sample of the...
Acompound contains C, H and O as the elements. A 20.0 g-sample is comprised of 1.34 g Hand also 8.00 g of C. What is the empirical formula of the compound? Select the equation or relationship that can be used to determine the change in internal energy of the surroundings. Oq=CXAT O AE = q +w OH= E + PV Ow=-PAV
A 10.0 g solid sample contains 14.0% NaHCO3 by mass; the rest is NaHSO4. Find the mass of CO2 gas it will produce if treated with an excess of hydrochloric acid. Molar masses: M(NaHCO3) = 84.007 g/mol, M(CO2) = 44.01 g/mol. The gas-evolution reaction: NaHCO3(s) + HCl(aq) = NaCl(aq) + H2O(l) + CO2(g). (A) 0.733 g (B) 1.47 g (C) 2.67 g (D) 4.51 g (E) 5.24 g
A 1.326 g sample contains only vitamin C (CHO) and sucralose (C,H,,C1,0). When the sample is dissolved in water to a total volume of 31.1 mL, the osmotic pressure of the solution is 4.77 atm at 295 K. What is the mass percent of vitamin C and sucralose in the sample? vitamin C: sucralose:
2. Consider a 4.0 L sample of gas contains 0.200 g H, 19.20 g 0, and 17.60 g Co, at 65.2°C. a. Determine the mol fraction of carbon dioxide. b. Determine the total pressure of the gas sample in atm. c. Determine the partial pressure of hydrogen.
A sample of gas contains 0.1100 mol of C2H,(g) and 0.1100 mol of H,O2(g) and occupies a volume of 11.3 L. The following reaction takes place: C2H/(B) +H2O2(g) CHOHCH2OH(g) Calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.
Which of the following contains the largest mass percent hydrogen? a.10.0 g H2S b.10.0 g H2O c.10.0 g C2H6 d.10.0 g CH4
Question 26 01 30 A 1.286 g sample contains only vitamin C (CHO) and sucralose (C,H,,C1,0). When the sample is dissolved in water to a total volume of 25.8 mL, the osmotic pressure of the solution is 5.73 atm at 301 K. What is the mass percent of vitamin C and sucralose in the sample? vitamin C: sucralose: %
Compound X contains only the elements C, H, S, and O. A 5.00g sample undergoes complete combustion to give 4.83 g of CO2, 1.48g of H2O and a certain amount of SO2, that is further oxidized and dissolved in water to form H2SO4. On titration of the H2SO4 , 109.8mL of 1.00M NaOH were needed for complete reaction. In a further experiment it was determined that X has two acidic hydrogens and titration of 5.00g of X with 1.00M NaOH...
8. The temperature of a 10.0 g sample of Ne gas at a pressure of 1.6 atm is 17°C. What is the volume of the sample? a 7.37 L d. 18.91 b. 9.38 x 10L e. 3.45 L c. 76.8 L 2 2 0c 111nt named the eye 1 1
A 7.83-g sample of HCN contains 0.290 g of H and 4.06 g of N. Find the mass of carbon in a sample of HCN with a mass of 3.37g.