1.8 g of ethane gas is used to boil 200 cm' of water. What
is the number of molecules
of the ethane gas?
[Relative atomic mass of
C = 12 and H = 1, Avogadro
constant = 6.02 x 10^23 mol ]

3.6 x 10²²molecules

Explanation:

Given parameters:

Mass of ethane gas  = 1.8g

Unknown:

number of molecules of ethane gas = ?

Solution:

To solve this problem, we first find the number of moles of ethane gas.

  Molar mass of ethane, C₂H₆  = 2(12) + 6(1) = 30g/mol

 Number of moles  =

Insert the parameters and solve;

  Number of moles  =   = 0.06mole

 1 mole of a substance contains 6.02 x 10²³ molecules

 0.06mole of ethane will contain 0.06 x 6.02 x 10²³  = 3.6 x 10²²molecules

passed in september 1935, these laws are known as nuremberg laws.   they forbid jews from marrying but not directly forced them to divorce aryans. what is most noticeable is the fact that the jews were defranchised, meaning by this that they were not expected to have any civil rights, including the right to vote. the right answer is deprived of the right to vote.

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.