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# Write balanced equations for each of the following by inserting the correct coefficients in the blanks:(a) $_{-}\mathrm{As}_{4} \mathrm{S}_{6}(s)+{_{-}\mathrm{O}_{2}(g)} \longrightarrow_{-}\mathrm{As}_{4} \mathrm{O}_{6}(s)+_{-}\mathrm{SO}_{2}(g)$(b) $_{-}\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}(s)+_{-}\mathrm{SiO}_{2}(s)+_{-}\mathrm{C}(s) \longrightarrow _{-}\mathrm{P}_{4}(g)+_{-}\mathrm{CaSiO}_{3}(l)+_{-}\mathrm{CO}(g)$(c) $_{-}\mathrm{Fe}(s)+_{-}\mathrm{H}_{2} \mathrm{O}(g) \longrightarrow-_{-}\mathrm{Fe}_{3} \mathrm{O}_{4}(s)+_{-}\mathrm{H}_{2}(g)$(d) $_{-}\mathrm S_{2} \mathrm{Cl}_{2}(l)+_{-}\mathrm{NH}_{3}(g) \longrightarrow_{-} \mathrm{S}_{4} \mathrm{N}_{4}(s)+_{-}\mathrm{S}_{8}(s)+_{-}\mathrm{NH}_{4} \mathrm{Cl}(s)$

## a)$\mathrm{As}_{4} \mathrm{S}_{6}(\mathrm{s})+9 \mathrm{O}_{2}(\mathrm{g}) \longrightarrow \mathrm{As}_{4} \mathrm{O}_{6}(\mathrm{s})+6 \mathrm{SO}_{2}(\mathrm{g})$b)$\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}(\mathrm{s})+3 \mathrm{SiO}_{2}(\mathrm{s})+5 \mathrm{C}(\mathrm{s}) \longrightarrow 2 \mathrm{P}_{4}(\mathrm{g})+3 \mathrm{Ca} \mathrm{SiO}_{3}(\mathrm{l})+5 \mathrm{CO}(\mathrm{g})$c)$3 \mathrm{Fe}(\mathrm{s})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \longrightarrow \mathrm{Fe}_{3} \mathrm{O}_{4}(\mathrm{s})+4 \mathrm{H}_{2}(\mathrm{g})$d)$6 \mathrm{S}_{2} \mathrm{Cl}_{2}(\mathrm{l})+16 \mathrm{NH}_{3}(\mathrm{g}) \longrightarrow \mathrm{S}_{4} \mathrm{N}_{4}(\mathrm{s})+\mathrm{S}_{8}(\mathrm{s})+12 \mathrm{NH}_{4} \mathrm{Cl}(\mathrm{s})$

#### Topics

Chemical reactions and Stoichiometry

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