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How many of the following have standard heat of formation is zero?
(i) \( \mathrm{Br}_{2(\ell)} \)
(ii) \( \mathrm{CO}_{2(\mathrm{~g})} \)
(iii) \( \mathrm{C}_{\text {(graphite) }} \)
(iv) \( \mathrm{Cl}_{2(\ell)} \)
(v) \( \mathrm{Cl}_{2(\mathrm{~g})} \)
(vi) \( \mathrm{F}_{2(\mathrm{~g})} \)
(vii) \( \mathrm{F}_{(\mathrm{g})} \)
(viii) \( \mathrm{I}_{2(\mathrm{~g})} \)
(ix) \( \mathrm{S}_{\text {(monoclinic) }} \)
(x) \( \mathrm{N}_{2(\mathrm{~g})} \)
(xi) \( \mathrm{P}_{\text {(Black) }} \)
(xii) \( \mathrm{P}_{(\mathrm{red})} \)
(xiii) \( \mathrm{CH}_{4} \)
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