Read More
Date: 18-4-2017
1588
Date: 24-4-2017
1312
Date: 24-6-2017
1299
|
Reaction stoichiometry
When you understand the weight relationships in a chemical reaction, you can do some stoichiometry problems. Stoichiometry refers to the mass relationship in chemical equations.
When you get ready to work stoichiometry types of problems, you must start with a balanced chemical equation. If you don’t have it to start with, go ahead and balance the equation.
Look at my favorite reaction — you guessed it — the Haber process:
N2(g) + 3 H2(g) ↔ 2 NH3(g)
Suppose that you want to know how many grams of ammonia can be produced from the reaction of 75.00 grams of nitrogen with excess hydrogen. The mole concept is the key. The coefficients in the balanced equation are not only the number of individual atoms or molecules but also the number of moles:
N2(g) + 3 H2(g) ↔ 2 NH3(g)
1 mole + 3 moles ↔ 2 moles
1 mol(28.014 g/mol) + 3 mol(2.016 g/mol) = 2 mol(17.031g/mol)
First, convert the 75.00 grams of nitrogen to moles of nitrogen. Then use the ratio of the moles of ammonia to the moles of nitrogen from the balanced equation to convert to moles of ammonia. Finally, take the moles of ammonia and number to grams. The equation looks like this:
A stoichiometric ratio — such as mol NH3/mol N2 — enables you to convert from the moles of one substance in a balanced chemical equation to the moles of another substance.
|
|
صنع الذكريات والتفكير يدمر الدماغ.. دراسة تشرح السبب
|
|
|
|
|
الصين.. عودة كاسحتي الجليد إلى شنغهاي بعد انتهاء بعثة استكشافية إلى القطب الجنوبي
|
|
|
|
جامعة الكفيل تكرم الفائزين بأبحاث طلبة كلية الصيدلة وطب الأسنان
|
|
مشروع التكليف الشرعي بنسخته السادسة الورود الفاطمية... أضخم حفل لفتيات كربلاء
|
|
ضمن جناح جمعيّة العميد العلميّة والفكريّة المجمع العلمي يعرض إصداراته في معرض تونس الدولي للكتاب
|
|
جامعة الكفيل تعقد مؤتمرها الطلابي العلمي الرابع
|