[فيصل الفريد]

السلام عليكم ورحمة الله :
بالله حاول تجاوب ولي على هذه الأسئلة :
Caf2+H2SO4____ CASO4+2HF 1/
IF 6.00g of Caf2 are treated with an excess of H2 SO4 and yield2.8 g of HF .Calculate the percent yield of HF (AW Ca=40. F=19 .H=1 .S=32 .O=16 )
الجواب : 90.9 %
بس كيف طريقة الحل :

2/ CALCULATE THE PERCENT composition by mass of hydrogen in sodium bicarbonate NAHCO3 ) (( NA=23 H=1. C=12. O=16 ) ) )
الجواب 1.19%
بس كيف طريقة الحـــل :


3/THE MASS of potassium that can be produced from the reaction :
Na +KCL ------ K +NaCl
Na =50 g kcl=100g
Na=23 . k=39 cl= 35.5 ))
الحل 52.3 g :


4/ the theoretical yield of NACL is :
NAOH+ HCL-------- NaCL +H2O
الحــــــل / 58.5 g


5/ The empirical formula of a compound of uranium and fluorine that is composed of 67.6% uranium and 32.4% fluorine is
الجـــواب UF6:


6/ 4NH3 +5O2 ______ 4NO + 6H2O
IF THE reaction of 150g of ammonia with 150g of oxygen gas yields 87.g of nitric oxide(NO). what is the percent yield of this reaction ?
الجــــواب 33%


7/ how many of O ATOMS are there IN 51.4 g CASO4 ?

الجواب
9.09X10^23


8/ how many moles of CL atoms are therein 65.2 g CHCL3 ?

الجواب :
1.64 MOL


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