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Home Question Bank Chemistry Archive 2025 January 14

Chemistry Questions from Jan 14,2025

Browse the Chemistry Q&A Archive for Jan 14,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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31. Calcular el porcentaje de pureza de un mineral de hierro, si una muestra de 448 g del mineral impuro produce 12 g de hidrógeno según la reacción: \( (\mathrm{Fe}=56 ; \mathrm{H}=1) \) \( \mathrm{Fe}_{(\mathrm{s})}+\mathrm{HCl}_{(\mathrm{ac})} \Rightarrow \mathrm{FeCl}_{3(\mathrm{ac})}+\mathrm{H}_{2(\mathrm{~g})} \) A. \( 44 \% \) B. \( 48 \% \) C. \( 49 \% \) D. \( 50 \% \) E. \( 56 \% \) What is the \( \% \) of aluminum in \( \mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3} \) ? Balanceo de ecuaciones \( \square \mathrm{C}_{4} \mathrm{H}_{10}+\square \mathrm{O}_{2}+\rightarrow \square \mathrm{CO}_{2}+\square \mathrm{H}_{2} \mathrm{O} \) What percent of \( \mathrm{AgNO}_{3} \) is silver? What percent of \( \mathrm{Zn}_{3}\left(\mathrm{PO}_{4}\right)_{2} \) is zinc? What percent of glucose, \( \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6} \), is carbon? Balanceo de ecuaciones \( \square \mathrm{Na}_{2} \mathrm{SO}_{3}+2 \mathrm{HCl}_{+} \rightarrow \square \mathrm{NaCl}+1 \mathrm{H}_{2} \mathrm{O}+1 \mathrm{SO}_{4} \) 55.8 51,8 106 What percent of \( \mathrm{MgBr}_{2} \) is magnesium? 1. What percent of \( \mathrm{Fe}(\mathrm{OH})_{3} \) is oxygen? a) The equation for the reaction of strontium hydroxide with hydrochloric acid is shown below. \[ \mathrm{Sr}(\mathrm{OH})_{2}+2 \mathrm{HCl} \rightarrow \mathrm{SrCl}_{2}+2 \mathrm{H}_{2} \mathrm{O} \] \( 25.0 \mathrm{~cm}^{3} \) of a solution of strontium hydroxide was exactly neutralised by \( 15.00 \mathrm{~cm}^{3} \) of \( 0.100 \mathrm{~mol} \mathrm{dm}^{-3} \) hydrochloric acid. Calculate the concentration, in mol dm , of the strontium hydroxide solution.
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