A tube is open at both ends with the air oscillating in the 4th harmonic. How many displacement nodes are located within the tube?

Heat of reaction at constant volume is measured in the apparatus:

The dissociation energy ofCH4 is 400 kcal mol and that of ethane is 670 kcal m or the bond energy is:

The bond dissociation energy of C-H in CH4 from the equation
Kcal is:

The heats of combustion of rhombic and monoclinic sulphur are -70960 and -71030 calorie respectively What will be the heat of conversion of rhombic sulphur to monoclinic sulphur?

Given, KJ
KJ
KJ The heat of formation of

Heat of combustion of CH₄ , C₂, C₂H₄ and C₂H₄ are -212.8, -373.0, -337.0 and -310.5 kcal respectively at the same temperature. The best fuel among these gases is:

Standard heat of formation for CCI₄, H₂0, CO₂ and HCI at 298K are - 25.5, - 57.8, 94.1 and 22.1 kJl mol respectively. For the reaction,
what will be

If for and -188 kJ mol-I and-286kJ mol , what will be the enthalpy change of the reaction

Which of the following units represents the largest amount of energy?

If KJ
KJ
KJ
KJ
the heat of foundation will be:

ABCD is a parallelogram and P is the intersection of the diagonals. If O is any point then OA+OB+OC+OD =

If the vectors  and  form a triangle then λ=

Let  is greatest integer function. If  and  are parallel vectors then =

For such questions, we should know the concept of greatest integer number. We should also know the properties of parallel vectors.

The points with position vectors  and  are collinear for

For such questions, we should know how to find the vector joining two points. Also, we should know the condition for two vectors to be collinear.

A= (1,1,1) B=(1,2,3) C=(2,-1,1) then the length of the internal bisector of is