Plz anybody could answer it

2.88 x 10⁻¹³mol

Explanation:

Given parameters:

Concentration of chlorophyll in seawater = 1.2nanomoldm⁻³

Volume of seawater  = 1cm³

Unknown:

Mass of magnesium present = ?

Solution:

To solve this problem, we need to obtain the number of moles of the solute in the sea water.

Since we have been given the value of concentration, our work is easy to do;

           Number of moles  = concentration  x volume

Let us convert the given volume to dm³;

                1000cm³ = 1dm³

                    1cm³ is  = 0.001dm³

      Number of moles  = 1.2nanomoldm⁻³ x 0.001dm³

                                       = 1.2 x 10⁻³ nanomol

                                       = 1.2 x 10⁻³ x 10⁻⁹mol

                                      = 1.2 x 10⁻¹²mol

Formula of the compound:

             C₅₅ H₇₇ Mg N₄ O₅

        1 mole of C₅₅ H₇₇ Mg N₄ O₅ contains 1 mole of Mg

       1.2 x 10⁻¹²mol of C₅₅ H₇₇ Mg N₄ O₅ will contain  1.2 x 10⁻¹²mol of Mg

Since we now know the number of moles of Mg;

          Mass  = number of moles x molar mass

                      = 1.2 x 10⁻¹²  x 24

                      = 28.8 x 10⁻¹²mol

                       = 2.88 x 10⁻¹³mol

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

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