Problemas

If you start with 10.0 grams of lithium hydroxide (LiOH) how many grams of Ilthium bromide (LIBr) will be produced? LiOH+HBrarrow LBr+H_(2)O 7.58 758 2.76g 36.258 Multiple Choice 10 points
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To determine how many grams of lithium bromide (LiBr) will be produced from 10.0 grams of lithium hydroxide (LiOH), we need to follow these steps:<br /><br />1. **Write the balanced chemical equation:**<br /> \[<br /> \text{LiOH} + \text{HBr} \rightarrow \text{LiBr} + \text{H}_2\text{O}<br /> \]<br /><br />2. **Calculate the molar masses of the reactants and products:**<br /> - Molar mass of LiOH: \( 6.94 \, (\text{Li}) + 15.999 \, (\text{O}) + 1.008 \, (\text{H}) = 23.946 \, \text{g/mol} \)<br /> - Molar mass of LiBr: \( 6.94 \, (\text{Li}) + 79.904 \, (\text{Br}) = 86.854 \, \text{g/mol} \)<br /><br />3. **Convert the mass of LiOH to moles:**<br /> \[<br /> \text{Moles of LiOH} = \frac{10.0 \, \text{g}}{23.946 \, \text{g/mol}} \approx 0.417 \, \text{mol}<br /> \]<br /><br />4. **Use the stoichiometry of the reaction to find the moles of LiBr produced:**<br /> According to the balanced equation, 1 mole of LiOH produces 1 mole of LiBr. Therefore, 0.417 moles of LiOH will produce 0.417 moles of LiBr.<br /><br />5. **Convert the moles of LiBr to grams:**<br /> \[<br /> \text{Mass of LiBr} = 0.417 \, \text{mol} \times 86.854 \, \text{g/mol} \approx 36.258 \, \text{g}<br /> \]<br /><br />Therefore, the correct answer is:<br />\[ \boxed{36.258 \, \text{g}} \]
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