Рассчитайте относительные молекулярные массы соединений а)nahco3, b)na3po4,c)h3po4,d)p2o5,e)fe2(so4)3 . !
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Ответы на вопрос:
А)nahco3 16*3+12+1+23=84 б)na3po4 23*3+16*4+31=164 c)h3po4 3+16*4+31=98 d)p2o5 16*5+31*2=142 e)fe2(so4)3 56*2+32*3+16*4*3=112+96+192=400
2she is flying a kite too 3 we are riding a bike too 4 they are playing soccer too 5 i am playing basketball too 6 they are making a sandcastle too 7 we are watching tv too 8 they are sleeping too
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