Berilliy atomining absolyut (haqiqiy) massasini aniqlang., 9, 5,418٠10-22, ) 1,5٠10-23, 0,668٠10-23, Qaysi moddaning molekulyar massasi eng kichik, [Ca(OH)]2SO4, [Al(OH)2]3PO4, Ca(HSO4)2, Ba(OH)NO3, “Azofoska” mineral o’g’iti tarkibida ammoniy digidrofosfat – NH4H2PO4 (massa ulushi – 82%), ammoniy gidrofosfat – (NH4)2HPO4 (7%), kaliy nitrat – KNO3 (4%) va tarkibida azot bo’lmagan aralashmalar kiradi. Azofoskadagi azotning massa ulushini va massasi 120 kg bo’lgan o’g’itdagi atomar azotning miqdorini aniqlang., 8,4% va 1,56 mol, 12% va 1,03 mol, 14% va 1,89 mol, 9,5% va 2,04 mol, Tarkibida pirit – FeS2 minerali bo’lgan massasi 50 g tog’ jinsi namunasidan massasi 11,2 g bo’lgan temir ajratib olingan. Namunadagi piritning massa ulushini aniqlang, 22.4, 35.2, 42.9, 48, Kalsiy gidrofosfat kristallogidratida (presipitat) CaHPO4 ∙ nH2O da 18% fosfor bor. Kristallgidrat tarkibidagi ‘n’ ning qiymati necha?, 1, 2, 5, 10.
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