الله يعطيك الف عافيه ما قصرتي وربي
بس وانا جالسه احل في اسئله ما عرفتها
اذا احد يعرف طريقه الحل كيف ؟؟؟؟
(15) The mass of mole of the compound Al2X3 is found to be 150.26 . What is the anion X in the compound ?
(a) F
(a) S*
(b) N
(c) O
(16) Morphine, an addictive drug, has the molecular formula C17H19NO3.The number of Oxygen atoms in 25 g of morphine is:
(a) 9.01×1023
(b) 1.59×1023 *
(c) 0.53×1023
(d) 15.89×1023
(19) The molecular formula of ascorbic acid (vitamin C) is C6H8O2. To three significant figures what is the percentage carbon in vitamin C?
(Atomic weights: C = 12.01, O = 16.00, H = 1.008).
(a) 64.3*
(b) 34.8
(c) 28.5
(d) 81.4
(22) What is the name of one of two or more forms of an element ?
(a) Compound .
(b) Allotropes . *
(c) Elements .
(d) Isotopes .
(25) What is the limiting reagent in the process , 3.00 g of calcium are treated with 2.00 g of fluorine to prepare CaF2 , and how much excess reagent (in moles) is left at the end of the reaction 7?
(Atomic weights: Ca = 40.08, F = 19.00).
Ca + F2 CaF2
(a) Ca, 0.075
(b) Ca, 0.022
(c) F2, 0.022*
(d) F2, 0.053
هنا عرفت ايجاد limiting بس السؤال الثاني ؟؟ ما عرفته ؟؟
(26) Reaction of 1.00 mole CH4 with excess Cl2 yields 96.8 g CCl4. What is the percent yield of CCl4 ?
(Atomic weights: C = 12.01, Cl = 35.45).
CH4 + 4 Cl2 CCl4 + 4 HCl
(a) 64.3
(b) 57.3
(c) 65.9
(d) 62.9*
(30) Fluoxymesterone, C20H29FO3, is an anabolic steroid. A solution is prepared by dissolving 0.01 g of the steroid in 500.0 mL of water. If this solution is diluted to a final volume of 1.00 L. What is the resulting molarity?
(Atomic weights: C = 12.01, O = 16.00, F = 19.00, H = 1.008).
(a) 5.94 x 10-11
(b) 2.38 x 10-11
(c) 5.94 x 10-8
(d) 1.488 x 19-5*