# An unknown metal alloy with a mass of 390 g is taken from boiling water and dropped into

An unknown metal alloy with a mass of 390 g is taken from boiling water and dropped into an insulated cup that contains 553 g of water at an initial temperature of 18.7°c. the final temperature of the system is 26.8°c. what is the metal's specific heat capacity?

## This Post Has 3 Comments

1. Expert says:

cant without the picture! ?

2. superfly903 says:

so specific heat capacity of unknown metal is 656.8 J/degree C kg

Explanation:

Here by energy balance we can say that energy given by metal alloy at 100 degree = heat absorbed by water at 18.7 degree C

now we have

$Q_{in} = Q_{out}$

$390 s (100 - 26.8) = 553 (4186 ) ( 26.8 - 18.7)$

$28548 s = 18750349.8$

now we have

$s = \frac{18750349.8}{28548}$

$s = 656.8 J/kg ^o C$

so specific heat capacity of unknown metal is 656.8 J/degree C kg

3. Expert says:

It won't lose or gain electrons if it's a covalent bond it shares the electrons with another atom or atoms. if it is an ionic bond it will lose the 3 electrons on the outer shell and become a positively charged ion.  credit goes to @sunshinebaby of answers.yahoo.com.