General Chemistry 4th Edition . University Science Books presented by Sapling Le

Question

General Chemistry 4th Edition . University Science Books presented by Sapling Leaing Map Du Po Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 2.90 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase bX more than 10.0 ? Use Cp2 30.8 J/(K-mol) for Na() at 500 K. De Pol Yo Yo Number 3.67x 10 g Yor un O H o w There is a hint available! View the hint by clicking on the divider bar again to hide the hint Close Et O Previous Give Up & View Solution e Check Answer 0 Net Hint

Explanation / Answer

delta T = 10 oC
Q = 2.90 MJ = 2.90*10^6 J
C = 30.8 J/K.mol = 30.8 J/oC.mol

step 1: calculate number of mol of Sodium
Q = n*C*delta T
2.90*10^6 = n*30.8*10
n = 9.416*10^3 mol

step 2: convert this to mass

Molar mass of Na = 22.99 g/mol

mass of Na,
m = number of mol * molar mass
= 9.416*10^3 mol * 22.99 g/mol
= 2.16*10^5 g
Answer: 2.16*10^5 g

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