Jism moddalardan tashkil topgan

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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 :

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