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How many moles (of molecules or formula units) are in each sample? 71.04 g CF2Cl2 26.7 kg Fe (NO3) 2 0.1170 g C8H18 121 kg CaO
Calculate the amount (in moles) of (a) Cu2+ ions in 3.00 g of CuBr2
Question 5 (0.5 marks) Chlorofluorocarbons such as CF2Cl2 have been used as refrigerants. The standard enthalpy of vaporization of CF2Cl2 is 15.4 kJ/mol. Calculate the mass (kg) of liquid CF2Cl2 needed to cool 500.0 g of water from 60.0 °C to 40.0 °C. You may need to obtain some data from your textbook when answering this question. Mass of CF2Cl2 required:
Calculate the mass of 3.7 moles of Br2.
Calculate the moles and the mass of solute in 190.9 mL of 0.472 M CaClz. moles of solute mass of solute in grams
a) Calculate the molar mass of CH14. 1.2 b) Calculate the number of moles of hexane in 0.774 g of C&H14. c) Calculate the mass in grams of 0.0406 moles of hexane.
1-Calculate the mass in grams of 2.55 moles of KCl 2- Calculate how many moles are in 2.00x1020 molecules of CO2 3- How many atoms of H are there in 1.00x1019 molecules of NH3
Calculate the mass of 0.00456 moles of (NH4)2SO4
17 Calculate the energy associated with 3.00 moles of photons from red light with 750 nm wavelength. A. 479 kJ B. 160 kJ C. 215 kJ D. 320 kJ E. 640 kJ