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# Write balanced equations for each of the following by inserting the correct coefficients in the blanks:(a) $_{-}\mathrm{Cu}(s)+_{-}\mathrm{S}_{8}(s) \longrightarrow_{-}\mathrm{Cu}_{2} \mathrm{S}(s)$(b) $_{-}\mathrm{\mathrm{P}}_{4} \mathrm{O}_{10}(s)+_{-}\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow_{-}\mathrm{H}_{3} \mathrm{PO}_{4}(\mathrm{l})$(c) $_{-}\mathrm{B}_{2} \mathrm{O}_{3}(s)+_{-}\mathrm{NaOH}(a q) \longrightarrow_{-}\mathrm{Na}_{3} \mathrm{BO}_{3}(a q)+_{-}\mathrm{H}_{2} \mathrm{O}(l)$(d) $_{-}\mathrm{CH}_{3} \mathrm{NH}_{2}(g)+_{-}\mathrm{O}_{2}(g) \longrightarrow_{-}\mathrm{CO}_{2}(g)+_{-}\mathrm{H}_{2} \mathrm{O}(g)+_{-}\mathrm{N}_{2}(g)$

## a) $16 \mathrm{Cu}(\mathrm{s})+\mathrm{S}_{8}(\mathrm{s}) \longrightarrow 8 \mathrm{Cu}_{2} \mathrm{S}(\mathrm{s})$b) $\mathrm{P}_{4} \mathrm{O}_{10}(\mathrm{s})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \longrightarrow 4 \mathrm{H}_{3} \mathrm{PO}_{4}(1)$c) $\mathrm{B}_{2} \mathrm{O}_{3}(\mathrm{s})+6 \mathrm{NaOH}(\mathrm{aq}) \longrightarrow 2 \mathrm{Na}_{3} \mathrm{BO}_{3}(\mathrm{aq})+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})$d) $4 \mathrm{CH}_{3} \mathrm{NH}_{2}(\mathrm{g})+9 \mathrm{O}_{2}(\mathrm{g}) \longrightarrow 4 \mathrm{CO}_{2}(\mathrm{g})+2 \mathrm{N}_{2}(\mathrm{g})+10 \mathrm{H}_{2} \mathrm{O}(1)$

#### Topics

Chemical reactions and Stoichiometry

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