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How to remember mass numbers of 118 elements? How many grams of Cu(OH)2 will precipitate when excess NaOH solution is added to 41.0 mL of 0.736 M CuBr2 solution? Y^(4)-4y'''=0? An embty 60l petrol tank has a mass of 10kg what will be its mass when full of fuel of R.D of 0.72? Two containers are similar.if the larger one with a height of 20cm holds 2.5 liters of liquid,?