When a certain metal is cooled from 130°C it releases 415 Joules. What is the mass of the metal if it’s specific heat capacity is 0.24 J/g°C?

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a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

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