1. You are given the number of moles of carbon and must convert it to an equivalent mass using the molar mass from the periodic table. The carbon sample is 0.045 moles.

 

2.  How many moles of potassium are in 525.0 g of pure potassium? Explain

Done Expert Q&A Indirect Amalysis of Potassiem Prelaberatory Assigment Name and Drawer Number A 1079 g sample that contained some potassiumwas dissolved in deioninew and died so an㎞exchange o inthe hydrogen m The elute tuohtin t wing required 14.65 ml. of0.00218 M NaOH to Peach end po of its a Calculate the mamher of moles of ' thst were reacted ather the adio of 14.65 l of sodium hydroxide solution b. Convent the number of moles of reacted H" to the number of moles of K" that was added to the ion exchange columm by using Reaction (20-3) c. Use the moles of potassium in the 10.00 ml solution added to the column to calculate the moles of potassium in the entire 100.0 ml of solution originally prepared d. Use the molar mass ofpotassium and the number ofmoles of K"dun was calculated instep c, to determine the mass of potassium in the 100.00 ml of solution originally prepared e. Use the mass of potassium in the 100.0 mL. solution and the total mass of the sample (1.079 g) to calculate the percent potassium in the sample. 136-