How many moles of 02 would be needed to react 58.5 g of h2 to form water??
Answers
Answer:
Because Hydrogen and Oxygen react in a 2:1 molar ratio to form water, you need to know how many moles of Hydrogen gas are contained in 58.5 g of H2.
58.5 g H2 x (1 mole H2 / 2.058 g/mole H2) = 28.5714 moles H2
Because of the 2:1 H2:O2 molar ratio, divide the moles of H2 by 2 to get the number of moles O2 = 14.286 moles O2. Rounded to 3 sig. fig, the value is 14.3 moles O2. This is also the number of moles of Water produced.
To find the total mass of the water, multiply the number of moles of water by the molecular mass of water” 14.286 moles H2O x 18.057 g/mole H2O = 257.97 g H2O. Rounded to 3 sig. fig. this equals 258 g. H2O.
Remember, use all of the decimal places available during the calculations and THEN round the answer to the proper number of significant figures.
Explanation:
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