The mass is 376gA) What is the volume of the copper?B) How many copper atoms are in the sample?C) What is an equation for the reaction?D) How many grams of oxygen are required to completely react with the copper?E) How many grams of copper(II) oxide will result from the reaction of 8.56g Cu and 3.72g oxygen?F) How many grams of copper(II) oxide will result in part D if the percent yield for the reaction is 85%?PLEASE HELP.. EVERY LITTLE BIT DOES HELP... THANK YOU SO MUCH
A) You need to find the density of copper (try wikipedia) and use this to find the volume (the density tells you how many grams 1 mL weighs). B) You can use the formula moles = mass / molecular weight to figure out how many moles this sample is. Since 1 mole = 6.022 x 10^23 molecules, you can use this to find how many copper atoms are in the sample. C) The equation is 2Cu + O2 --> 2CuO D) Using what you already calculated (the number of moles in the sample of copper) and the equation in C to figure out that there is 0.5 moles of oxygen reacted for each mole of copper, you can work out how many moles of oxygen are needed, and then using this and the fact that mass = moles x molecular weight, you can calculate the mass needed. E) You need to convert both of these masses to moles, to determine which of these is the limiting reagent (that is, when all of one has been used up, and there is still more of the other left over, the first is the limiting reagent). Then use this reactant to calculate the number of moles of CuO produced (= moles of Cu or twice the moles of O2), and thus the mass. F) If the yield of the reaction is 85%, then the moles of CuO will be 0.85 x moles of Cu.
Oxygen has a 6 electron valence shell; it oftentimes desires 2 to end its octet and alter into good. this suggests that an outstanding compound might finally end up with oxygen interior the -2 state (meaning it picked up 2 electrons), and its substantial different could be +2 (dropping 2 electrons). contained regarding Copper, confident, Copper +2 is time-honored as Copper (II). +a million and +2 are effortless oxidation states of copper, with +2 being the greater good. So, confident, 2Cu(II) + O2 ---> 2Cu(II)O.
