A mass of 200 kg is kept on the ground. If it covers an area of 1200cm². Calculate the pressure exterted by it. The depth of water in a pond in 5cm. Calculate the pressure exerted by water at the bottom of the pond. (density of water =1000kg/m³.

The pressure exerted by a cubical box of mass 50 kg and side 50 cm is equal to the liquid pressure in a vessel. If the density of liquid is 100kg/m³ , find the height of liquid. ​

the solar system used to have much dust particles option no d

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.