1 Molecule of MgCl2 = 95.11
1 Mole in 1 molecule of MgCl2 is
1
95.11
= 0.010514
Or Total moles in 309 gm of MgCl2 is #0.010514*309 = 3.2488
Answer is 3.2488 moles
So 200/25 is equal to 8, and because of that, the plot has 8 weeds per square kilometer.
Sponges are similar to other animals in that they are multicellular, heterotrophic, lack cell walls and produce sperm cells. Unlike other animals, they lack true tissues and organs, and have no body symmetry.
The shapes of their bodies are adapted for maximal efficiency of water
flow through the central cavity, where it deposits nutrients, and leaves
through a hole called the osculum. Many sponges have internal skeletons of spongin and/or spicules of calcium carbonate or silicon dioxide. All sponges are sessile
aquatic animals. Although there are freshwater species, the great
majority are marine (salt water) species, ranging from tidal zones to
depths exceeding 8,800 m (5.5 mi).
I believe that it would be that mass and texture affect the amount of friction. Hope this helps!
