Question

3. How many grams of H2O would be produced if 20.5 grams H2 react with 80.5 grams 02 inthe reaction:H2 +02 →H20

Answer 1

Step-by-step explanation:

We first start by balancing the given reaction:

`2H_2\text{ + O}_2\text{ }\rightarrow\text{ 2H}_2O`

Then we determine the mass of H2O from H2:

`\begin{gathered} m(H2O)\text{ = }(m(H2))/(M(H2))\text{ }*\text{ }(mol(H2O))/(mol(H2))\text{ }*\text{ M\lparen H2O\rparen} \\ \\ \text{ = }(20.5)/(2.016)*(2)/(2)\text{ }*18.01528 \\ \\ \text{ = 183.19g} \end{gathered}`

Then we determine the mass of H2O from O2:

`\begin{gathered} m(H2O)\text{ = }(m(O2))/(M(O2))\text{ }*(mol(H2O))/(mol(O2))\text{ }*\text{ M\lparen H2O\rparen} \\ \\ \text{ = }(80.5)/(32)\text{ }*(2)/(1)\text{ }*\text{ 18.01528} \\ \\ \text{ = 90.64g} \end{gathered}`

Answer:

mass of H2O = 90.64g