Dilute 98% (density 1.84 g / cm3) concentrated sulfuric acid to 4 mol / L dilute sulfuric acid 250 ml, how many ml of concentrated sulfuric acid are taken

54.35mL

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1. In salt water selection, salt water with density of 1.1x10 ^ 3kg / m ^ 3 is needed In the selection of salt water, salt water with a density of 1.1x10 ^ 3kg / m ^ 3 is needed. A student prepared 350ml salt water, and the quality of the salt water is 0.6kg. Ask whether the salt water meets the requirements? If not, how much water or salt should be added? Especially the process of how much to add!
2. Salt water seed selection is a kind of seed selection method invented by the working people in China. At present, salt water with density of 1.1 × 10 ~ 3 kg / M ~ 3 is needed. If the quality of 0.6 DM3 salt water is 540 G (1) Please calculate whether the brine meets the requirements? (2) If not, should salt or water be added? How many kg?
3. The density of salt water is 1.1g/cm3. In order to test whether the prepared salt water meets the requirements, 500ml salt water sample is taken, and its mass is 0.6kg. Please analyze whether such salt water meets the requirements. If not, how much salt or water should be added per 500ml of the original salt water?
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9. An aluminum ball has a mass of 810g and a volume of 400cm ^ 3. Is it hollow? (p aluminum = 2.7 * 10 ^ 3kg / m ^ 3) (please answer in three ways)
10. The mass of a hollow aluminum ball is 27g. After the hollow part is filled with alcohol, its total mass is 51g. The volume of the aluminum ball is calculated. (the density of the aluminum ball is 2.7 × 103kg / m3, and the density of the alcohol is 0.8 × 103kg / m3)
11. Dilute concentrated sulfuric acid with 18.4 mol / L concentration and 18.4 g / cm * 3 density to 1 000 ml, 2 mol / L concentration and 1.2 g / cm * 3 density Dilute 18.4 mol / L concentrated sulfuric acid with density of 18.4 g / cm * 3 to 1000 ml, 2 mol / L concentrated sulfuric acid with density of 1.2 g / cm ^ 3. Calculate: 1. Volume of concentrated sulfuric acid required; 2. Volume of water required
12. To prepare 200 grams of 20% dilute sulfuric acid with 98% concentrated sulfuric acid (density 1.84 g / cm3), how many ml of concentrated sulfuric acid and water are needed Company
13. A factory uses 98% concentrated sulfuric acid (density is 1.84 g / cm3) to prepare 30% dilute sulfuric acid for production. The volume ratio of concentrated sulfuric acid to water is the closest to () A. 1：3B. 1：4C. 1：5D. 1：6
14. 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?
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