Jism moddalardan tashkil topgan
Download 209.02 Kb.
|
1-dars
|
Moddaning molecular massasiga son jihatdan teng qilib , gramm hisobida olingan miqdori uning gramm-molekulasi yoki qisqacha mol deb deb ataladi . Masalan , sulfat kislotaning molecular massasi 98 ga teng . 196 g sulfat kislota 2 gramm – molekulani tashkil etadi . Moddadagi kimyoviy elementning massa ulushi (ω)shu element nisbiy atom massasini molekuladagi shu atom soniga ko’paytmasini moddani nissbiy molekulyar massasiga nisbatiga teng : 
ω(X) – X elementning massa ulushi ; Ar (X) – X elementining nisbiy atom massasi ; n – modda molekulasidagi X element atomining soni ; Mr – moddaning nisbiy molekulyar massasi . Massa ulushi odatda foizda ifodalanadi : 
Masalan suvdagi H2O dagi vodorod va kislorodning massa ulshuni hisoblaymiz :  Download 209.02 Kb. Do'stlaringiz bilan baham: 
|