What is the mass (in grams ) for 88.624 moles of silver (Ag)? (Round your answer to a whole number (no decimal)

To go from moles to grams, molar mass needs to be used as a conversion factor.  The Periodic Table tells you the molar mass of silver.  Mine says it's 107.9 g/mol.  Start the unit analysis with the given data and then multiply by the conversion factor:

Notice that units of moles is in the denominator to allow us to cancel out the moles.

Taking significant figures into account, the mass for 88.624 moles of silver is 9562.5 grams.  However, since we are rounding to the nearest whole number, the answer is simply 9562 grams.

9562 grams

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2