20% li eritma tayyorlash uchun 50 g shakarni necha g suvda eritish kerak?

20% li eritma tayyorlash uchun 50 g shakarni necha g suvda eritish kerak?

A) 100 B) 200 C) 300 D) 250

40 g oltingugurt (VI) oksidning 920 g suvda eritilishidan hosil boigan eritmaning foiz konsentratsiyasini aniqlang.

A) 5,1 B) 6 C) 10,2 D) 4,35

Kobalt(II) xloridning massa ulushi 15% bo’lgan eritmasini tayyorlash uchun 476 g CoCI₂·6H₂O kristallgidrat necha gramm suvda eritilishi kerak?

A) 628 B) 958 C) D) 1257