Someone who is good in chemistry please help.

2.0×10⁻⁶ mol

Prefix = (2)  

exponent = (-6)

Explanation:

Given data:

Number of molecules of water = 1.23×10¹⁸ molecules

Number of moles of water = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules of water

1.23×10¹⁸ molecules × 1 mol / 6.022 × 10²³ molecules

0.20×10⁻⁵ mol

2.0×10⁻⁶ mol

Prefix = (2)  

exponent = (-6)

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.