5kg of water (cp = 1 j/kgoc) is pumped to a height of 0.5 m, work done by the motor is 50 j/kg, and heat liberated by it is 5 j/kg, what is the final temperature of the water if the initial temperature was 0 c?
a) 4 c
b) 6 c
c) 2 c
d) 8 c

In any atom of any element, you will find protons and neutrons in the nucleus of any atom 

27. =3,500,000 x 4,000 = 14,000,000,000

Answer is:     molar solubility of  yttrium fluorid is 4.23·10⁻⁶ m. balanced chemical reaction: yf₃(s)  → y³⁺(aq) + 3f⁻(aq). ksp = 8.62·10⁻²¹. ksp = [y³⁺]  · [f⁻]³.[y³⁺] = [yf₃] = s.[f⁻] = 3[yf₃] = 3s.ksp(yf₃)  = s  · (3s)³.8.62·10⁻²¹ = 27s⁴.s(yf₃)  =  ⁴√(8.62·10⁻²¹  ÷ 27).s(yf₃)  = 0.00000423 m.s(yf₃) = 4.23·10⁻⁶ m.