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At present, concentrated H2SO4 with a mass fraction of 98% and a density of 1.84 g / cm3 is diluted to 500 ml dilute sulfuric acid with a mass concentration of 9.2 mol / L (1) How many ml of 98% concentrated sulfuric acid do you need? (2) If 100ml is taken out of 500ml, what is the concentration of the substance in the solution? What is the concentration of H + substance? If 100ml dilute sulfuric acid is taken out and reacted with enough zinc particles, how much hydrogen can be produced under standard conditions?
(1) 9.2 × 0.5 = 4.6mol, 4.6 × 98 = 450.8gx = 450.8 / (1.84 × 98%) = 250ml (2) or 9.2mol/l, the concentration of H + is 18.4mol/l, 100ml × 9.2mol/l = 0.92mol, that is, 0.92mol hydrogen is produced, so the volume of hydrogen under standard condition is 0.92mol × 22.4l/mo = 20.608l
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