Fill-in-the blank.  Make sure to include the plus and negati…

Fill-in-the blank.  Make sure to include the plus and negative signs.  Do not write spaces.  (Example: If the answer is positive four enter +4 not + 4).  The sulfur atom in the sulfite ion, SO32-, has an oxidation number of [1].  The oxidation number of the number of bromine in Br2 is [3]. The aluminum atom in aluminum hydride, AlH3, has an oxidation number of [2].

Chromium(VI)  is considered a hazardous, carcinogenic specie…

Chromium(VI)  is considered a hazardous, carcinogenic species, destruction of which may be accomplished by the process shown in the balanced equation below:             4 Zn (s) + K2Cr2O7 (aq) + 7 H2SO4 (aq) → 4 ZnSO4 (s) + 2 CrSO4 (s) + K2SO4 (aq) + 7 H2O (l) Which is the limiting reactant when 5.00 moles of Zn and 2.00 moles of  K2Cr2O7 react in excess H2SO4?

When solid sodium chloride is added to aqueous sulfuric acid…

When solid sodium chloride is added to aqueous sulfuric acid, hydrogen chloride gas and aqueous sodium sulfate are produced. What is the stoichiometric coefficient for hydrogen chloride when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?