1) In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B. 2A —>3B How many molecules of substance B are produced when 25.5 g of substance A reacts? The molar mass of substance A is 23.8 g/mol. Step 1: Convert the mass of A to moles. moles of A: ? mol Step 2: Convert the number of moles of A to the number of moles of B. moles of B: ? mol Step 3 Convert the number of moles of B to molecules of B. Molecules of B: ? Molecules

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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1) In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B. 2A —>3B How many molecules of substance B are produced when 25.5 g of substance A reacts? The molar mass of substance A is 23.8 g/mol. Step 1: Convert the mass of A to moles. moles of A: ? mol Step 2: Convert the number of moles of A to the number of moles of B. moles of B: ? mol Step 3 Convert the number of moles of B to molecules of B. Molecules of B: ? Molecules 2) A solution of NaCl(aq) is added slowly to a solution of lead nitrate, Pb(NO3)2(aq), until no further precipitation occurs. The precipitate is collected by filtration, dried, and weighed. A total of 19.98 g PbCl2(s) is obtained from 200.0 mL of the original solution Calculate the molarity of the Pb(NO3)2(aq) solution. Concentration: ? M 3) Write the balanced neutralization reaction that occurs between H₂SO, and KOH in aqueous solution. Phases are optional. neutralization reaction: Suppose 0.650 L of 0.430 M H₂SO, is mixed with 0.600 L of 0.270 M KOH. What concentration of sulfuric acid remains after neutralization? concentration: ? M H2SO4 4) A 190.0 mL solution of 2.293 M strontium nitrate is mixed with 220.0 mL of a 2.788 M sodium fluoride solution. Calculate the mass of the resulting strontium fluoride precipitate. mass: ? g Assuming complete precipitation, calculate the final concentration of each ion. If the ion is no longer in solution, enter a 0 for the concentration. [Na+]=? M [NO-3]= ? M (minus is over the 3) [Sr2+]=? M [F-]=? M Please help me with these homework problems, Thank you!
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