Question text
What is the molar mass of Al2O3? (Use 3 significant figures)
Select one:
a. 43.0
b. 113
c. 102
Question text What is the molar mass of Al2O3? (Use 3 significant figures) Select one: a....
What is the molar mass of alumina: Al2O3 ?
1 U12 PUILLS PIEVIUUS RUISVEISTILLIICIIa u.UUU. LV VIY IVULCST ASR Tuul Tlalnel Al(s) + O2(g) → Al2O3(s) (a) Consider the unbalanced equation above. How many grams of O2 are required to react with 40.0 g of aluminum? Use at least as many significant figures in your molar masses as in the data given. 4.9 285 |x gO₂ (b) What mass of Al2O3 is produced? 40 g Al2O3 Submit Answer Practice Another Version
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MST SHOW ALL CALCULATIONSs. Please be neat. Use correct significant figures. 1. A student masses an empty flask, aluminum foil (witha small pinhole), and copper wire and finds the mass to be 54.8680 g. She then adds about 5.0 mL of an unknown liquid and heats the flask in a hot waterbath to 95.0 °C. After all the liquid is vaporized, she removes the flask from the bath and masses it after it has cooled. The mass...
What is the molar mass of copper (II) sulfate, CuSO4? Select one: O A. 63.55.9 OB. 159.629 O C. 111.55 g D. 319.17 g O E. 16.00 9 An unknown compound is composed of the elements Nitrogen and Oxygen. The compound is analyzed and determined to be 30.45% and 69.55% 0. The molecular mass of the compound is found to be 02.01 g/mol. Determine the compound's molecuar formula and provide your answer below as Nxoy where x and y are...
1. What is the molar mass of KHC,H04 to 4 significant digits (use two decimal places off of the periodic table)? Use the following data to complete the lab: Trial 1 Trial 2 Trial 3 Mass of KHC,H,04 () 1.19 1.16 1.22 0.20 1.52 Initial volume of NaOH 0.12 im Final volume of NaOH 27.36 26.50 29.28 1 a. Complete the following table for each trial. Trial 1 Trial 2 Trial 3 Mass of KHC3H04 () Moles of KHC HOA...
What is the percent composition of 1 molar mass of NaBr? Select one: O a. 30.27% Sodium and 69.73% Bromine b. 22.34% Sodium and 77.66% Bromine C. 14.11% Sodium and 85.89% Bromine O d. 23.42% Sodium and 76.58% Bromine
Answers to 5 significant figures
3. (a, to c) What are the three measures of centre location) we use in characterising a data set? (d, e, f) What are the three measures of variability we use in characterising a data set? (g to n) Write down the symbols for sample mean, population mean, sample standard deviation, population standard deviation, sample variance, population variance, sample size and population size. (pp 44, 80 to 84, 96 to 102) 14
What is the molar mass of zinc sulfite heptahydrate, ZnSO3 7H2O? Select one: O a. 468 g/mol O b.272 g/mol O c. 336 g/mol O d. 164 g/mol . e. 146 g/mol Clear my choice
if 3 significant figures is required, correct answer: 0.123 wrong answers: 0.12, 0.13, 0.1234; if 3 decimal places is required, correct answer: 0.456, wrong answer: 0.45, 0.4, 0.4564; if question asking for molar mass of H20, correct answer: 18.015 g/mol; wrong answer: 18.015. You will lose all credit if you dont write correct unit in your answer. What is the mass percent of O in MgCO3? A. 14.2% B. 19.0% C. 28.8% 56.9% What is the mass of 8.04 x...
One molecule of a compound weighs 2.14e–22 g. Its molar mass is: Select one: a. 121 g / mol b. 129 g / mol c. 2.81 g / mol d. none of these e. 7.76e–3 g / mol