Which of the statements about mole ratios are true? Select all that apply. A. Mole ratios include coefficients from a balanced chemical equation.
B. Mole ratios do not include stoichiometric coefficients.
C. Mole ratios can only be formed between two products.
D. Mole ratios can only be formed between two reactants.
E. Mole ratios can be formed between any combination of reactants and/or products.
F.
Mole ratios always have reactants in the numerator and products in the denominator.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.