A 1.507 g sample was found to contain 0.872 g SiO2, 0.206 g NH4Cl, 0.155 g NaCl, and the remainder being Fe. Calculate the percent composition of your mixture.
A 1.507 g sample was found to contain 0.872 g SiO2, 0.206 g NH4Cl, 0.155 g...
A mixture was found to contain 1.20 g of NH4Cl, 0.90 g of NaCl, and 1.20 g of SiO2. What is the percentage of Ammonium Chloride in this mixture?
A 2.902 g sample of calcium chloride is decomposed into its constituent elements and found to contain 0.690 g Ca and 2.222 g Cl. calculate the mass percent composition of Ca and Cl in this sample.
10. A sample weighing 106.7 grams is analyzed and found to contain 42.97 g of potassium, 28.57 g of chromium; the remainder is oxygen. What is the empirical, or simplest, formula of this substance? 1027 11·An organic compound is analyzed and found to be 38.71 % carbon and 9.68 % hydrogen; the rest is oxygen. If the molecular weight of this substance is 62 g/mol, what is the molecular formula of this substance? 12. A sample weighing 112.2 grams is...
A solid sample (Sample 1) is analyzed and found to contain 1.47 g carbon and 0.123 g hydrogen. A second sample (Sample 2) is expected to be composed of the same pure compound. If Sample 2 is found to contain 2.17 g hydrogen, how much carbon is expected in the sample ?
7. Upon gravimetric analysis of a hydrate, the sample was found to contain 2.573 g of FeCl3 and 1.715 g of H20. a. Based on this data, what is the empirical formula for the hydrate? b. What is the mass percent of water in the hydrate?
A mixture of NaCl and NaBr has a mass of 2.06 g and is found to contain 0.77 g of Na. What is the mass of NaBr in the mixture? Express your answer using two significant figures.
A 23.20-g sample of a gaseous compound containing carbon, oxygen, and chlorine is determined to contain 2.76 g C, 4.29 g O, and 16.15 g Cl. What is this compound’s percent composition?
A 0.8690 g sample of a mixture of NaCl and KCl is dissolved in water, and the solution is then treated with an excess of AgNO3 to yield 1.933 g of AgCl. Calculate the percent by mass of each compound in the mixture. % mass NaCl = ? % mass KCl = ?
A sample found on the lab bench is analyzed and found to contain Y, Ba, Cu, and O. The inorganic compound contains 13.34% Y, 41.23% Ba, and 16.81% O. When 0.173 grams of the sample is dissolved in 25 mL of cyclohexane the mixture freezes at 6.28°C. WHAT IS THE MOLECULAR FORMULA FOR THE INORGANIC COMPOUND? f.p. cyclohexane=6.55°C kf (cyclohexane) = 20.2°C/m ?(cyclohexane) = 0.779 g/mL kf (H2O) = 1.858°C/m kb (H2O) = 0.512°C/m
Be sure to answer all parts. A 0.9340 g sample of a mixture of NaCl and KCl is dissolved in water, and the solution is then treated with an excess of AgNO3 to yield 1.913 g of AgCl. Calculate the percent by mass of each compound in the mixture. % mass NaCl % mass KCl