This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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a) Allotropy is the existence of two or more different physical forms (allotropes) of the same element in the same physical state. These forms differ in physical properties but have similar chemical properties. b) The two allotropes of sulphur are: rhombic sulphur and monoclinic sulphur. 9 Concentrated sulphuric(VI) acid (H2SO4) is 98\% by mass and has a density of 1.84 g cm^-3. Calculate its molarity. Molar mass of H2SO4 = 2(1) + 32 + 4(16) = 98 g mol^-1. Step 1: Mass of 1 dm^3 (1000 cm^3) of solution. Mass = density × volume = 1.84 \, g cm^-3 × 1000 \, cm^3 = 1840 \, g. Step 2: Mass of H2SO4 in 1 dm^3 of solution. Mass of H2SO4 = 98\% × 1840 \, g = 0.98 × 1840 = 1803.2 \, g. Step 3: Moles of H2SO4. Moles = 1803.2 \, g98 \, g mol^-1 = 18.4 \, mol. Step 4: Molarity. Molarity = 18.4 \, mol1 \, dm^3 = 18.4 \, mol dm^-3. 18.4 ^-3