How many kilojoules of energy are needed to raise the temperature of 506g of wat

Question

How many kilojoules of energy are needed to raise the temperature of 506g of water from 25.0 degree C to 87.0 degree C? (Given: Sp. heat of water = 4.184 J/g degree C and 1 kj = 1000 J) Write the electron configuration for Mg (atomic number 12) and Cu (atomic number 29). Write the full electron configuration NOT the abbreviated version. Magnesium Copper: a) write the number of electrons, protons, and neutrons for the following isotope _24Cr^53 Electrons: Protons: Neutrons: b) A lithium atom is smaller than a potassium atom. true or false c) Chlorine has lower ionization energy than aluminum. true or false (circle one)

Explanation / Answer

Question 27

Q in kJ for:

m = 506 g of water from

T = 25° to T = 87°C

if

C = 4.184 J/gC

so

the heat equation is given by

Q = m*C*(Tf-Ti)

substitute values

Q = 506*4.184 * (87-25)

Q = 131260.448 J

Q = 131260.448/1000 kJ = 131.260 kJ

Q =  131.260 kJ

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