Calculate the number of CO2 molecules in 7.13×10−2 mole of CO2. Express your answer using three significant figures.
Chemistry 1405
Calculate the number of CO2 molecules in 7.13×10−2 mole of CO2. Express your answer using three...
calculate the mass in grams of each sample 9.55×10^19 CH4 molecules Express your answer using three significant figures
Calculate the number of moles of HCN produced when 12.4 moles of Ozare consumed. Express your answer using three significant figures. 2 NH3 • 2 CH4 + 3O2--> 2 HCN + 6 H2O Calculate the number of moles of HCN produced when 12.4 moles of Ozare consumed. Express your answer using three significant figures. 2 NH3. 2 CH4 + 3O2--> 2 HCN + 6 Hao Calculate the mass of NO2, in grams, needed to completely react with 25.9 grams of...
calculate the number of equivalents.
0.8 mole of Mg2+ Express your answer using one significant figure.
Calculate the mass in grams of each sample. 2.3×1022 SO2 molecules. = ______ g Express your answer using two significant figures. 4.3×1025 O3 molecules =________ g Express your answer using two significant figures. 9.30×1019 CH4 molecules =________ g Express your answer using three significant figures.
I need help
Sewani 1151 <EC Ch 6-7 Problem 7.30 Part A Calculate the number of Li atoms in 5.6 moles of Li Express your answer using two significant figures. νοΙ ΑΣφ ? NI; = 3.4 atoms of Li Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining Part B Calculate the number of CO2 molecules in 2.25x 10-2 mole of CO2 Express your answer using three significant figures. EVO AED ? Noo;- molecules of co Type...
Part ACalculate the bond energy per mole for breaking all the bonds in methane, CH4.Express your answer to four significant figures and include the appropriate units.ΔHCH4 =1656 kJmolCorrectIn CH4, the energy required to break one C−H bond is 414 kJ/mol. Since there are four C−H bonds in CH4, the energy ΔHCH4 for breaking all the bonds is calculated asΔHCH4=4×bond energy of C−H bond=4×414 kJ/mol=1656 kJ/mol CH4 moleculesPart BCalculate the bond energy per mole for breaking all the bonds of oxygen,...
A) Calculate [H3O+][H3O+] for solution 1.85×10−3 MM HNO3.HNO3. Express your answer to three significant figures and include the appropriate units. B) Calculate [OH−][OH−] for solution 1.85×10−3 MM HNO3.HNO3. Express your answer to two significant figures and include the appropriate units. C) Calculate [OH−][OH−] for solution 2.9×10−3 MM KOHKOH. Express your answer to two significant figures and include the appropriate units. D) Calculate [H3O+][H3O+] for solution 2.9×10−3 MM KOHKOH. Express your answer to two significant figures and include the appropriate units....
An electron travels at 0.494c. 1. Calculate its Einsteinian momentum. (Express your answer to three significant figures.) ______________ x 10^-22 kg m/s 2. Calculate its Einsteinian kinetic energy. (Express your answer to three significant figures.) _____________ x 10^-15 J 3. Calculate its rest energy. (Express your answer to three significant figures.) _____________ x 10^-14 J 4. Calculate the total energy of the electron. (Express your answer to three significant figures.) ____________ x 10^-14 J
Calculate the [OH−] of each aqueous solution with the following [H3O+]. A.) coffee, 1.1×10−5 M Express your answer using two significant figures. B.) soap, 1.0×10−8 M Express your answer using two significant figures. C.) cleanser, 5.0×10−10 M Express your answer using two significant figures. D.) lemon juice, 2.6×10−2 M Express your answer using two significant figures.
An aqueous solution contains 31% HCl by mass. Calculate the molality of the solution. Express your answer using two significant figures. Calculate mole fraction of the solution. Express your answer using two significant figures.