The limiting reactant is completely consumed in a chemical reaction. (t/f)

Yes

Explanation:

Limiting reagent is the reagent which limits the formation of product as it gets completely consumed in the reaction.

Excess reagent is the reagent which is left unreacted in the reaction.

For example:  

If there are 2 moles of and 2 moles of

As can be seen from the chemical equation,

2 moles of hydrochloric acid react with 1 mole of calcium.

Thus 2 moles of will completely react with 1 mole of calcium and (2-1)=1 mole of calcium will remain as such.

Thus HCl is the limiting reagent as it limits the formation of product and calcium is the excess reagent as it is left unreacted.

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.