An iron bar at 325 k is placed in a sample of water. the iron bar gains energy from the water if the temperature of the water
a) 65 k
b) 45 celsius
c) 65 celsius
d) 45 k

The temperature of the water is 65 Celsius.

Explanation:

The temperature is measured in Celsius and Fahrenheit. Moreover, the kelvin is the SI unit of temperature, and 1 Kelvin is equal to -272.15 Celsius.  

So, 272.15 Kelvin would be equal to 0 Celsius. Hence, 325 Kelvin would be around 51.85 degrees of Celsius. To give the iron bar energy, the water should be warmer than 52-degree Celsius. So, the iron bar would gain energy from water when the temperature of the water would be 65-degree Celsius.

the answer is barium and copper bromide