<span>In 5.70 mol of Hafnium there are 34,326 208 203*10^23 atoms.</span>
When carbonate sediments are subjected to thermal or regional metamorphism, the CO2 cannot often escape and the carbonate minerals simply recrystallize; calcite and dolomite commonly form marble. Carbonate minerals can therefore be common in some metamorphic rocks.
Answer : The energy required to heat of 1.50 kg iron is, 
Explanation :
Formula used :

or,

where,
Q = heat required = ?
m = mass of iron = 1.50 kg = 1500 g
c = specific heat of iron = 
= initial temperature = 
= final temperature = 
Now put all the given value in the above formula, we get:


Therefore, the energy required to heat of 1.50 kg iron is, 
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