Some of the common problems that affect the big toe joint include: Bunions. Bunions are an enlargement of the big toe joint and can cause pain from shoe pressure or from damage occurring within the joint. Our goal when treating bunions is to eliminate pain and stop or slow the growth of the bunion.
We know that volume occupied by one mole of a gas is its molar volume. This applies to a liquid and a solid too. So, molar volume of water, a liquid is the volume occupied by one mole of water, in any form. So, 1 mole of water occupies 18 grams. Since density of water is almost equal to 1, we take the grams of water as volume of water. So, Molar volume, or the volume occupied by one mole of water would be 18 milliliters.
A mole is a quantity (in grams) that equals the molecular number of the substance. Oxygen has atomic number 16, hydrogen 1, so H2O = 2*1+16=18. So indeed a mole of water is 18grams. The mole (animal) is something like a rat. The qustions (1, 2, 3) you have are rather like quizes, they don't really have answers.