Question

can someone please check my maths to make sure I did it right? I was worried about my standard deviation. Thank you kindly in advance!

Data Table 2. Calculating percent by mass of HC,H,O, from molarity Trial 1 Trial 2 Trial 3 Moles of HC,H,O, in vinegar sample 0.004227 0.004227 0.004270 Mass (g) HC,H,O, in vinegar sample 0.2538g 0,25389 (0.25649 Volume (mL) of vinegar sample 5,00mL 5,00 mL 5,00mL Mass (g) of vinegar sample 5,0250 5,051% 5,025g 5.051% 5.025g 5,102% Percent by mass of HC,H,O, in vinegar Average % by mass of HC,H,O, in vinegar 5,068% Standard deviation 10.000 2948 Calculations for percent by mass of HC,H,O, in vinegar 1. Convert moles of HC,H,O, in the vinegar sample (from Data Table 1) to grams of HC,H,O, using its the molar mass of HC H:02. 2. Convert mL of vinegar to grams of vinegar using the density of vinegar (assume d = 1,005 g/mL) 3. Divide grams HC,H,O, to grams of vinegar and multiply by 100 to get the percent by mass. mass percent HC,HO, = (grams HC,H,O,/ grams of vinegar ) x 100 Show your calculations for Trial 1 below: 0 0,004227 mol HC2 H₂ qx 60,052gt2 H302 = 0,2538g HQ H₂ Q @ 5.00mL vinegar x 1.005 g vinegar = 5,025g vinegar ③ Mass Percent He H₂O₂ = 0,2538g Hq Hs 2 5,025 g Viregar = 5.051%

Answer 1

1. Tral #1 Trial # 2 | Trial #3 Moles of HC₂H₂O2 0.0014227 0.004227 0.004270 in vinegar sample Mass (g) itC2H3 O2 in (0.004227x60.052), 0.25389 vinegar sample = 0.25649 moles of HGH302X = 0.2538g Molar mass of HC2H302 volume (mt) of 5:00 ml 5.oomL 5.00ml vinegar sample Mass of vinegarsauuple (5x1.005) 9 = 5.0259 5:0259 5:0259 = Volume * Lensity Percent by mass ope 0.2538 HC2H30, in vingar 51005x1007 . 5.051% 5.102% Mass of HC2H300X100 = 500517. mass of vinegar Average % by mass 5:051+5.051 +5:1025%. = 5068% of HC 2 H 3 O2 in vinegar standard deviation 0.024 calculation for standard deviation : Mean = 5:068 IN= total no. of values Standard deviation (6) - V E -)2 x= indevisual value V = Mean - 5.068 or o=13445.051 - 5-068)4 (51057–5048)2.c =(0.000289 +0.000 289 +0001156) = 0.000578 = 0.024