H2O is formed from the elements H2 and O2 following the shown chemical equation:
So, the moles of O2 is equal to half of moles of H2O produced.
Molar mass of H2O = 18 g.mol-1
Thus, 25 g water = (25 / 18) mol = 1.389 mol.
Thus, moles of O2 needed = (0.5 x 1.389) mol = 0.6945 mol
Now, 1 mol of O2 is equal to 6.023 x 1023 molecules of O2.
Thus, no of molecules of O2 = (0.6945 x 6.023 x 1023) = 4.183 x 1023.
How many oxygen gas molecules do you need to make 25 g of water vapor (H2O)? Balanced chemical equation:
Write a balanced equation for the chemical reaction Acetylene gas (C2H2) burns in a welding torch with oxygen to form carbon dioxide gas and water vapor.C2H2(g) + O2(g) ==> CO2(g) + H2O(g) It isn't balanced. I will leave that for you.How do I balance it?trial and error. C2H2 + O2 ==> CO2 + H2O. I see 2 C on the left and only 1 on the right so I place a coefficient of 2 for CO2 on the right. And...
Part A Determine the balanced chemical equation for this reaction. C8H18(g)+O2(g)?CO2(g)+H2O(g) Enter the coefficients for each compound in order, separated by commas. For example, 1,2,3,4 would indicate one mole of C8H18, two moles of O2, three moles of CO2, and four moles of H2O. 2,25,16,18 SubmitHintsMy AnswersGive UpReview Part Correct It is important to balance a chemical equation before using it for calculations. Checking that equations are balanced will help you avoid many errors in chemistry problems. Balanced chemical equation...
Consider the balanced chemical equation that follows. You are asked to determine how many moles of water you can produce from 4.0 mol of hydrogen and excess oxygen. (Excess oxygen means that so much oxygen is available it will not run out.) Which of the numbers that appear in the balanced chemical equation below are used to perform this calculation? 2H2(g)+O2(g)→2H2O(l) A. the coefficients for hydrogen and oxygen are used B. the coefficients for water and hydrogen are used C....
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20 1 point Hydrogen and oxygen gas react explosively to product water vapor. How many grams of water are made from the reaction of 39.6 grams of hydrogen gas and an excess of oxygen? Reaction: 2H2(g) + O2(g) - 2H2O(g) Type your answer Previous Next