Which is the correct mole ratio of k3po4 to kno3 in the chemical reaction mg(no3)2 + k3po4 ®mg3(po4)2 + kno3?

3Mg(NO3)2 + 2K3PO4 ---> Mg3(PO4)2 + 6KNO3

n(K3PO4):n(KNO3)=2:6=1:3
n(K3PO4):n(KNO3)=1:3

Answer : option c) heat is released during the process.explanation :

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.