Предмет: Химия, автор: dori1999

сколько весит железная проволка , в которой содержится 2 моль железа ?

Ответы

Автор ответа: ziborova2899

железная - алюминий в три раза легче железа, значит сечение алюминиевой проволоки будет больше (и электрическое сопротивление соответственно меньше), кроме того, удельное сопротивление алюминия меньше, чем у железа, значит разница в сопротивлении будет еще больше, чем различие в плотности железа и алюминия.
Плотность алюминия - 2,7*103кг/м3; Плотность железа - 7,9*103кг/м3; значит сечение алюминиевой проволоки будет в 7,9 / 2,7 = 2,925 раз больше. удельное сопротивление алюминия равно 0,029, удельное сопротивление железа - 0,135, значит железная проволока равного веса и равной длинны будет иметь сопротивление в 2,925 *0,135 / 0,029 = 13,62 раз больше алюминиевой проволоки.

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