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A sample of iron was dissolved in hydrochloric acid. The liberated hydrogen was collected by displacement of water. The hydrogen occupied 262 mL at 26°C. The barometric pressure was 748 torr. What mass of iron was dissolved? The vapor pressure of water is 25 torr at 26°C. Fe(s) + 2HCl(aq) ® FeCl 2 (aq) + H 2 (g)

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