A chemist prepares a solution of mercury(11) hodide (Hels) by measuring out 0.019 mol of mercury(II) lodide into a 450 ml. volumetric flask and filling the flask to the mark with water Calculate the concentration in mol/L of the chemist's mercury(II) fodide solution. Round your answer to 2 significant digits mo 0 0 1 X Check roma miolo Toto CLIC An unknown compound has the following chemical formula: Mn(CN) where x stands for a whole number, Measurements also show that a certain sample of the unknown compound contains 5.10 mol of carbon and 2,5 mol of manganese Write the complete chemical formula for the unknown compound. 2 ? A chemist mixes 83.1 g of benzene with 45.1 g of thiophene and 60.4 g of isopropenyibenzene. Calculate the percent by mass of each component of this solution Round each of your answers to 3 significant digits component mass percent 0.P benzene X 6 G ? thiophene isopropenylbenzene This is the chemical formula for methyl tert-butyl ether (the clean-fuel gasoline additive MTBE): CHOC(CH), A chemical engineer has determined by measurements that there are 4.95 moles of carbon in a sample of methyl tert-butyl ether. How many moles of oxygen are in the sample? Round your answer to 3 significant digits. 5 ? A chemist prepares a solution of sodium chloride (NaCl) by weighing out 46.8 g of sodium chloride into a 400 ml volumetric flask and Filing the flask to the mark with water. Calculate the concentration in g/dl. of the chemist's sodium chloride solution. Round your answer to 3 significant digits. B