12 14 2016 RWW01 Substance Stoichiometry Paddy Sheehan CH 201 section 002 Fall 2016 Instructor Robert Warren WebAssign RWW01 Substance Stoichiometry Homework Current Score 100 Due Friday August 26 2016 11 59 PM EDT The due date for this assignment is past Your work can be viewed below but no changes can be made 1 20 points Report the answers to the following operations to the correct number of significant figures Assume that all numbers are measurements no integers Round your answers Round up for a 5 For example 2 25 should be reported as 2 3 to two significant digits operation calculator correct result result 13 3 1416 40 841 No Response 41 3 2 0 004592 3 1954 No Response 3 2 20 31 No Response 20 31 7 45 12 86 4 34286 4 34235 2 68594 1 8988e 04 No Response 1 9e 04 or 0 00019 or 1 9E 04 or 1 9E 4 or 1 9e 4 or 00019 2 5 points What is the mass of potassium in a sample of K2CO3 that contains 1 53 g of oxygen No Response 2 47 g K 3 6 points The compound X3Y2 is 44 8 X What is the molar mass of Y if the molar mass of X is 64 2 g mol No Response 118 7 g mol 4 9 points What is the formula of a compound if a sample of the compound contains 0 407 mol X 0 611 mol Y and 0 814 mol Z See instructions for writing formulas in the Instructions box of the assignment No Response X2Y3Z4 http www webassign net web Student Assignment Responses last dep 14314082 1 3 12 14 2016 RWW01 Substance Stoichiometry 5 9 points What is the simplest formula of a rhenium oxide that is 82 32 Re by mass Write the symbol of the metal first No Response Re2O5 6 9 points What is the empirical formula of a compound that is 56 95 Cu 14 37 S and 28 68 O Write the elements in the order Cu S and O No Response Cu2SO4 7 9 points A 2 061 g sample of an oxide of Pt contains 1 771 g Pt What is the empirical formula of the oxide No Response PtO2 8 10 points What is the empirical formula of a hydrocarbon if complete combustion or 7 200 mg of the hydrocarbon produced 23 432 mg of CO2 and 7 194 mg of H2O Be sure to write C first in the formula empirical formula No Response C2H3 What is the molecular formula if the molar mass of the hydrocarbon is found to be about 110 molecular formula No Response C8H12 9 9 points What is the atomic mass of element X if 19 92 g XCl3 contains 4 49 g X atomic mass of X No Response 31 0 10 9 points What is the mass percent of sodium in Na2S2O3 No Response 29 08 http www webassign net web Student Assignment Responses last dep 14314082 2 3 12 14 2016 RWW01 Substance Stoichiometry 11 5 points Acetaminophen is C8H9N1O2 What mass of Acetaminophen contains 0 430 moles of N No Response 65 00 g http www webassign net web Student Assignment Responses last dep 14314082 3 3
View Full Document
Unlocking...