Question
Write a note on a zero order reaction.###What is a zero order reaction? Explain.
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Determine whether the reactions with the following $\Delta H$ and $\Delta S$ values are spontaneous or nonspontaneous. State whether they are exothermic or endothermic.
(a) $\Delta H =-110 kJ$ and $\Delta S =+40 JK ^{-1}$ at $400 K$
(b) $\Delta H =+50 kJ$ and $\Delta S =-130 JK ^{-1}$ at $250 K$.
→(a) $\Delta H =-110 kJ$ and $\Delta S =+40 JK ^{-1}$ at $400 K$
(b) $\Delta H =+50 kJ$ and $\Delta S =-130 JK ^{-1}$ at $250 K$.
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Calculate the standard enthalpy of the reaction :
$SiO_{2(s)}+3 C_{\text {(graphite) }} \longrightarrow SiC_{(s)}+2 CO_{(g)}$
From the following reactions,
(i) $Si _{( s )}+ O _{2(g)} \longrightarrow SiO _{2(s)}$,$\quad\quad\quad\quad\quad\quad\Delta_{r} H^{\circ}=-911 kJ$
(ii) $\ 2 C _{\text {(graphite })}+ O _{2(g)} \longrightarrow 2 CO _{( g )}$,$\quad\quad\quad\Delta_{ r } H ^{\circ}=-221 kJ$
(iii) $\ Si _{( s )}+ C _{\text {(graphite) }} \longrightarrow SiC _{( s )}$ , $\quad\quad\quad\Delta_{ r } H ^{\circ}=-65.3 kJ$
→$SiO_{2(s)}+3 C_{\text {(graphite) }} \longrightarrow SiC_{(s)}+2 CO_{(g)}$
From the following reactions,
(i) $Si _{( s )}+ O _{2(g)} \longrightarrow SiO _{2(s)}$,$\quad\quad\quad\quad\quad\quad\Delta_{r} H^{\circ}=-911 kJ$
(ii) $\ 2 C _{\text {(graphite })}+ O _{2(g)} \longrightarrow 2 CO _{( g )}$,$\quad\quad\quad\Delta_{ r } H ^{\circ}=-221 kJ$
(iii) $\ Si _{( s )}+ C _{\text {(graphite) }} \longrightarrow SiC _{( s )}$ , $\quad\quad\quad\Delta_{ r } H ^{\circ}=-65.3 kJ$