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If the molar mass of a substance is 44.01 g/mol, what is the mass of 1.05...
1. Complete the table below. #of moles Substance Mass (g) Molar mass (g/mol) a. Aspirin tablet (CoH&O) b. Wooden stick (CH2O) 0.325 14.482 c. Copper wire (Cu) 1.809 Show work below. a. b. с.
-What is the molar mass of methanol if 1.555 mol methanol has a mass of 48.25 g? in g/mol -The active ingredient in a common treatment for upset stomach is sodium bicarbonate, NaHCO3. Calculate the percent, by mass, of hydrogen in sodium bicarbonate. -Calculate the formula mass of dibromomethane, CH2Br2 in amu -Determine the percent of water in MgSO4 · 6 H2O to three significant figures. -What is the percent by mass (mass percent) of potassium in potassium borohydride, KBH4?...
D. MORE PRACTICE... Molar mass (g/mol) of moles 1. Complete the table below. Substance Mass® 2. Aspirin tablet (C4H4O) 0.325 b. Wooden stick LCH:0) 14.482 c. Copper wire (Cu) 1.809 Show work below. 2. A substance has a mass of 90.10 grams and contains 3.02 x 10" molecules. Which of the 3 substances in the chart above is it? Explain. 165 3. Find the % composition of each element in aspirin.
1. Which statement is true? A) The process of diluting a solution in the laboratory is much like preparing juice from a canned concentrate of the juice. B) Molarity is defined as the moles of solute divided by the liters of solvent. C) N2O5 has 2.5 times as many nitrogen atoms as oxygen atoms D) The number of formula units in 2.0 moles of MgCl2 is 6.022 x 1023 2. A 6.25 g sample of magnetite (Fe3O4) contains 4.52 g...
D. MORE PRACTICE... 1. Complete the table below. Massm m # moles Substance Mass (g) Molar mass (g/mol) of moles a. Aspirin tablet C.H.O.) 0.325 b. Wooden stick | (CHO) 14.482 c. Copper wire (Cu) Show work below. 1.809 2. A substance has a mass of 90.10 grams and contains 3.02 x 10 molecules. Which of the 3 substances in the chart above is it? Explain. 0 2 3 Fird noo or mores find mm mass per ind look at...
Molar mass (g/mol) 180 30 63.54 #of moles 1.805 x 103 0.4827 0.0284 1. Complete the table below. Substance Mass (g) a. Aspirin tablet (C.H.O.) 0.325 b. Wooden stick 14.482 (CH-0). c. Copper wire (Cu) 1.809 Show work below. a. CqHq Oy =9x12 + 8x1 + 4 x 16 = 180 g/mol b. CH₂O = 12 x 1 + 2x1 + 16x1 = 12 + 2 + 16 =30g/mol 170 g/mol = 0.00 105 males = 1.805.810 moles 14.482 9...
6. Complete the following table. Molar Mass of Mass of Substance Mass g/mol solute, g water ag Fructose 180 100 g Urea 150 g Lithium fluoride 25.9 2.5 g 164.1 Calcium nitrate 180 g Unknown compound 2.8 g 120 g (nonelectrolyte does not ionize) Expected freezing oint OC 1.32 1.62 -0.44 molality solution 0.14 0.48
Question 3 1 pts The molar mass of carbon dioxide is g/mol. Use the periodic table on the inside cover of your textbook. Question 4 1 pts A sample of NaHCO3 weighs 2.80g. The number of moles of NaHCO3 in the sample is .0333 moles. Question 5 1 pts A 2.83g sample of carbon dioxide contains .0643 moles of carbon dioxide.
Setup a problem to find the theoretical yield: A 15 mL sample contains 1.4 g Copper(II) nitrate. Use Reaction 1 to calculate the amount of copper wire needed to make this solution. Hint: Begin writing the balanced molecular Reaction that represents the chemical reaction. Identify the compounds that are involved in the chemical reaction and set up the stoichiometric calculation. Recall from lecture that you can convert from grams of substance A to grams of substance B using the molar...
A 3.10-g sample of lead nitrate, Pb(NO3)2, molar mass = 331 g/mol, is heated in an evacuated cylinder with a volume of 2.00 L. The salt decomposes when heated, the unbalanced equation for the decomposition reaction is shown below: Pb(NO3)2(s) → PbO(s) + NO2(g) + O2(g) Assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a temperature of 303 K? Assume the PbO(s) takes up negligible volume.