Web2 years ago. You generally round your final answer to the significant figures of your given with the fewest sig figs. If your givens are 9.5, 5.07, 7.993, and 3.32, you'd round to 2 …
How do you calculate the percentage of hydrogen in water?
WebAug 15, 2024 · What is the percent composition of each element in hydrochloric acid (HCl). Solution First find the molar mass of hydrogen. (5) H = 1.00794 g Now find the molecular mass of the HCl molecule: (6) 1.00794 g + 35.4527 g = 36.46064 g Follow steps 3 and 4: (7) ( 1.00794 g 36.46064 g) × 100 % = 2.76 % WebThe hydrogens make up 2g (since each mole of hydrogen is 1g) The oxygen makes up 16g. The percent composition of the compound is: H = (2g/18g) x 100 = 11.1% O = (16g/18g) x 100 = 88.9% Percent … scary stroke twins
Finding the percentage of an element in a compound by mass ...
WebTo determine percentage, you need to first determine how many moles of hydrogen peroxide are present. Rearrange PV=nRT to solve for n, then plug in your known values for P, V, R, and T. Show all your calculations from Experiment 1 for converting your temperature (T) to Kelvin. WebApr 16, 2015 · Assuming thet 100% of the hydrogen peroxide reacted, you'd get 0.33g ⋅ 1 mole H 2O2 34.015g = 0.0097 moles H 2O2 This means that you'd get 0.0097moles H 2O2 ⋅ 1 mole O2 2moles H 2O2 = 0.00485 moles O2 Rounded to two sig figs, the theoretical yield of oxygen gas will be nO2theoretical = 0.0049 moles O2 WebSolution. To calculate the percent composition, the masses of C, H, and O in a known mass of C 9 H 8 O 4 are needed. It is convenient to consider 1 mol of C 9 H 8 O 4 and use its molar mass (180.159 g/mole, determined from the chemical formula) to calculate the percentages of each of its elements: % C = 9 mol C × molar mass C molar mass C 9 H ... rundll32.exe user32.dll swapmousebutton