Ответы на вопрос:
mr(na2s) = 23*2 + 32 = 78
w(na) = ar(na) * n / mr(na2s) *100% = 23 *2 / 78 *100% =59%
w(s) = ar(s) * n / mr(na2s) *100% = 32 *1 / 78 *100% = 41%
mr(na2so3) = 23*2 + 32 = 16*3 = 126
w(na) = ar(na) *n / mr(na2so3) *100% = 23*2 / 126 *100% = 36,5%
w(s) = ar(s) * n / mr(na2so3) *100% = 32 *1 / 126 *100% = 25%
w(o) = ar(o) * n / mr(na2so3) *100% = 16 *3 / 126 *100% = 38%
Ω% = mв-ва*100%/mр-ра mр-ра = mводы + mв-ва (х) ω% = х*100%/( mводы + х)25 = х*100/(150 + х) 25*(150 + х) = х*100 3750 + 25х = 100х 75х = 3750 х = 50 (m соли)
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