[روزهـ]

The atomic masses of 6Li and 7Li are 6.0151 amu and 7.0160 amu,
respectively. Calculate the natural abanduce of these two isotopes.
The average atomic mass of Lithium (Li=6.941 amu).


ويكون الناتج 6Li= 7.49% , 7Li= 92.51%

75. Hydrochloric acid can be prepared by the following reaction:2NaCl(s) + H2SO4(aq)  2HCl(g) + Na2SO4(s)How many grams of HCl can be prepared from 2.00 mol H2SO4 and 150 g NaCl?


B. 93.5 g


. 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

D. 62.9


اللهـ يسعدكمـ ،، فهموني المسائل ذي ،،
بإختصار مسائل الـ exces وyiled
ناسيتهــآآآ ،،