150s Classroom → 40s Sub-90 Target27-Q Chemistry Mock
Archetype Sub-90 Dry-Wipe Invariant (Empirical/Molecular Formula from Reacting Mass Fractions & Hydrated Salt Water of Crystallisation (M·xH2O)): For hydrated salts M·xH2O heated from m_hydrated to m_anhydrous: m_water = m_hydrated - m_anhydrous, and x = (m_water / 18) ÷ (m_anhydrous / M_r(anhydrous)). Watch for 1 : 1.33 -> 3 : 4 (Fe3O4) and 1 : 1.5 -> 2 : 3 (Fe2O3).
sub90 ESATARCH-C-17: Empirical/Molecular Formula from Reacting Mass Fractions & Hydrated Salt Water of Crystallisation (M·xH2O)Chemistry
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SUB-90 ZONE (<35S)
0.0s35s Sub-9090s ESAT Budget150s Classroom
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Chemistry•ARCH-C-17•Standard 5-Option
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