Step to do part a Please guess the number

Part A: Reaction Stoichiometry Materials: Baking soda, vinegar, plastic weighing boat, balance, beakers, two Alka Selzer or other antacid tablets that list NaHCO, as an ingredient on the package Run the reactions in a clean and dry 250-mL beaker, with a plastic weighing boat (this is the white square dish in your lab kit) as a cover. Use your scale (also referred to as a balance below) for all mass measurements made in this lab. Clean up any sodium bicarbonate spills with paper towels and water, and dispose of excess down the drain with water. odium bicarbonate (NaHCO; or baking soda) (link to e data table. Pour 50 mL of acetic acid (vinegar) into f the beaker (with the sodium bicarbonate still -zero a balance and carefully measure the d, plus weighing boat and sodium Tare a weighing boat, measure 4.0 g of s photo of set up) and record the mass in th the beaker, and stack the weighing boat on top o in the weighing boat) (link to photo of set up). Re mass of the whole stack altogether: beaker with acetic aci bicarbonate on top. Record the mass in the data table. Without spilling any of the sodium bicarbonate or reaction mixture, return to your work area, and initiate the reaction by carefully transferring all of the sodium bicarbonate from the weighing boat into the acetic acid. (Note that the solution may overflow if you dump the sodiur bicarbonate too quickly.) Put the weighing boat back on top of the beaker and swirl the reactior mixture gently. After a few minutes, when the reaction is complete and no more bubbling is observed, weigh and record the total mass of the beaker, reaction mixture, and empty weighing boat. Pour the reaction mixture down the sink with plenty of water. Rinse the beaker thoroughly wit water (no soap required) and dry completely. Never put a wet beaker onto a balance! Repeat for two more trials. Do all the calculations for Part A. Decide which reaction A,B, or C (from the first page of the lab) is the correct one for this reaction