ChemistryAdvancedHigh School (11–12)Atoms and Molecules › Stoichiometry and ConcentrationNEETJEE Main
Created by StemPy LabA student heats of potassium chlorate until it decomposes completely: . The potassium chloride stays behind as a solid. All the oxygen is passed over of hot magnesium: . Atomic masses in : O 16, Mg 24, Cl 35.5, K 39. What is the largest mass of magnesium oxide that can form?
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← In a closed vessel, every reaction below goes to completion. All gas volumes are measured at the same temperature and pressure, high enough for water to stay a vapour. Statement I: 30 mL of hydrogen and 20 mL of oxygen react to give 30 mL of water vapour, and 5 mL of oxygen is left. Statement II: 1.0 L of oxygen, O₂, and 1.0 L of ozone, O₃, contain the same number of oxygen atoms.Assertion (A): In but-1-en-3-yne, CH₂=CH-C≡CH, the single bond that joins C-2 to C-3 is shorter than the carbon-carbon single bond of ethane, CH₃-CH₃. Reason (R): An sp hybrid orbital has 50% s character and an sp² orbital about 33%, both more than the 25% of an sp³ orbital, so their electrons are held closer to the nucleus. →
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