Answer:
m = 7.29 grams
Explanation:
Given that,
Initial temperature, T₁ = 25ºC
Final temperature, T₂ = 31.5ºC
The specific heat of the metal is 0.89 J/gºC.
We know that the heat released due to the change in temperature is given by :
![Q=mc\Delta T\\\\m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{42.2 }{0.89\times (31.5-25)}\\\\m=7.29\ g](https://tex.z-dn.net/?f=Q%3Dmc%5CDelta%20T%5C%5C%5C%5Cm%3D%5Cdfrac%7BQ%7D%7Bc%5CDelta%20T%7D%5C%5C%5C%5Cm%3D%5Cdfrac%7B42.2%20%7D%7B0.89%5Ctimes%20%2831.5-25%29%7D%5C%5C%5C%5Cm%3D7.29%5C%20g)
So, the mass of the piece is equal to 7.29 grams.
Her computer will start to heat up, and the temp. would be 60 degrees celcius.
I hope this helps you ᕕ( ᐛ )ᕗ
La respiración se produce en tres etapas: glicólisis, ciclo Krebs y transporte de electrones. En la glucólisis, la glucosa se divide en dos moléculas de piruvato. El ciclo Krebs tiene lugar en la matriz, y el transporte electrónico se realiza en la membrana interna.
Answer is: -601,2 kJ/mol
Chemical reaction: Mg(OH)₂ → MgO + H₂O.
ΔHrxn = 37,5 kJ/mol.
ΔHf(Mg(OH)₂) = <span>−924,5 kJ/mol.
</span>ΔHf(H₂O) = <span>−285,8 kJ/mol.
</span>ΔHrxn -enthalpy of reaction.
ΔHf - enthalpy of formation.
<span>ΔHrxn=∑productsΔHf−∑reactantsΔHf.
</span>ΔHf(MgO) = -924,5 kJ/mol - (-285,8 kJ/mol) + 37,5 kj/mol.
ΔHf(MgO) = -601,2 kJ/mol.
<em>The number of protons and electrons in a neutral atom of the element are;</em>
D. 29 protons and 29 electrons
<u>The atomic number of an element is equal to the number of protons in the nucleus of each atom of that element.</u>
<u>Thus copper has an atomic number of 29, all atoms of copper will have 29 protons.</u>