# Stoichiometry ,gas problem

by Big V
Tags: gas, mass, moles, solute, stoichiometry
 P: 2 the question is: Sodium Hydrogen carbonate (baking soda) is reacted with excess acetic acid (vinegar) with a concentration of 0.500mol/L in an Erlenmeyer flsk. The proucts are sodium acetate, water and carbon dioxide gas. The gas produced is collected in a balloon attached to the flask, tied off with a string and then weighed. Using the information from the data below, predict the mas of carbon dioxide produced and the percent error in the experiment. other data given : Mass of... balloon (g) 13.5 string (g) 1.2 balloon, string, gas (g) 16.5 solute (g) 5.0 the part i don't get is which number do i use to find moles so that later i can use those moles to find the mass . like is the mass of solute (5.0) , the mass of sodium hydrogen carbonate. please help sorry if i'm confussing
 HW Helper PF Gold P: 2,824 Determine these two pieces of information first: Write the balanced reaction. Compute how much gas is in the baloon. You said that the acetic acid is in excess, so the limiting reactant must be the sodium bicarbonate.
 P: 2 balanced reaction : (this is how i would set up my data) CH3COOH + NaHCO3 → CH3COONa + H2O + CO2 C= 0.500mol/l________________________ m=? Gas in Balloon: 16.5-1.2=15.3 -13.5= 1.8 gas =1.8g

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