لكل من يجيد مادة الفيزياء....ساااااعدوووووني

[fatma1]

السلام عليكمبما اننا على ابواب الامتحنااات فاتمنى من كل قلبي ان تساااعدووووني في مادة الفيزياء وخااااصه درس المووول بحكم معامل هده المادة4في 1ج م ع وانا لازلت لم افهم هدا الدرس المول فارجوووووكم ساااااااعدوووني:14::10:تحياتي للجميع مع تمنياتي لكل الطلبة بالتوفيق والنجااااح:15:

[LunaAlgerie]

فطومة المول ساهل لازم تفهمي برك بلي
1مول يقابله 6.023*10اس23 و هاد الرقم ممكن يكون عدد درات او عدد جزيئات
و الباقي كله هي قوانين فقط
ادا لم تفهمي شيء معين فاساليني ما نقدرش نشرحلك كلش الدرس طويل شويا
حنا ما طاحلناش بزاف المول فالاختبار
حظ موفق فطومة و اخطيك مالبارصا

[أبو محمود]

السلام عليكم ورحمة الله
الكتلة المولية

الكتلة المولية هى كتلة مول واحد من العنصر أو المركب الكيميائي. في الكيمياء,وهي كتلة عدد أفوغادرو من ذرات العنصر أو كتلة نفس العدد من جزيئات المركب الذي اشارت اليه لونا سابقا.تكون وحدات الكتلة المولية جرام/مول (g/mol). الكتلة الذرية الموجودة للعناصر في الجدول الدوري يمكن التعبير عنها بطريقتين: الأولى, كتلة ذرة "متوسطة" للعنصر بوحدة الكتل الذرية (u), والثانية, هى كتلة مول من العنصر مقدرة بالجرامات. والتعبير الثاني هو الكتلة المولية للعنصر وتستخدم بكثرة في حسابات قياسات الإتحاد العنصري. وف الفيزياء, الكتلة المولية غالبا ما يعبر عنها بالكيلو جرام لكل مول (kg/kmol). وتختلف الكتلة المولية عن الكتلة الجزيئية والتى تمثل "كتلة جزيء واحد".
بالتوفيق ان شاء الله

[fatma1]

شكرا لكل من لينا واخي الفاضل ملووووولي ...بارك الله فيكم.

[fatma1]

ممكن تعطوني ملخص لقونين المووول

[أبو محمود]

مثال عن التركيز المولي كمياء
التركيز المولي أمر بسيط وهي اخد المعطيات وتطبيقها على القانون التالي
C=n/v حيث C هيالتركيزالمولي ووحدتها مول/ل
أما n فهي كمية المادة المستعملة وتحسب بالقانون التالي n=m/M حيث mهي الكميةووحدتها الغرام و M هي الكتلة المولية ووحدتها المول غرام/مول و v تعطي لك في التمرين وممكن ان تكون بمل فيكفي تحويلها إلى اللتر بضربها في 10 أس 3- وهكدا عوض قيمة n و v في القانون السابق c=n/v وستجد قيمة c ولا تنسى الوحدة مول/لتر
مثااااااااااااااااااااااال:
تمرين 7 ص 142 :
من أجل تحضير اكلة المعكرونة تسخن الأم 5 لتر من الماء ثم نضيف ملعقتين من ملح الطعام NaCl أحسب التركيز المولي لملح الطعام في المحلول علما أن كل ملعقة تحتوي 4.2 غرام من كلور الصوديوم .
الحل :
النوع الكميائي: NaCl
حجم المحلول: V=5L
كتلة المداب : ملعقتين 4.2*2=8.4 حيث m=8.4 g
أولا نحسب الكتلة المولية الجزيئية لملح الطعام :

M = Mna + Mcl = 23 +35.5 = 58.5 g.mo
ثانيا نحسب كمية المادة في كتلة المذاب n=m/M
ومنه:
n = 8.4/58.4 = 0.14 mol
ثالثا نحسب التركيز المولي لهذا المحلول
c=n/v=0.14/5=0.028mol.L
لحساب الكتل المولية وذالك بتطبيق القانون التالي:
n=m/M
حيت nوحدتها molلان m وحدتها g وMوحدتها g/mol
اما التركيز المولي وذالك بلقانون التالي:
c=n/v
حيث وحدة cهي mol/l لان n وحدتهاmol وvحدتهاl
اما عن حساب التركيز الكتلي و ذلك بلقانون التالي:
t=m/v
حيث وحدة mهيg ووحدة vهي l
وt وحدتها g/l
بالتوفيق ان شاء الله

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