What mass of product, in grams, can be made by reacting 5.0g of aluminum and 22g of bromine?

Approximately (at most.)

Explanation:

Aluminum reacts with bromine at a ratio:

.

Look up the relative atomic mass of and . From a modern periodic table:

Calculate the formula mass of the reactants and of the product:

Calculate the quantity (in number of moles of formula units) of each reactant:

Assume that is the limiting reactant. From the coefficients:

.

Based on the assumption that is the limiting reactant:

.

In other words, if is the limiting reactant (meaning that is in excess,) then approximately of will be produced.

On the other hand, assume that is the limiting reactant. Similarly, from the coefficients:

.

Based on the assumption that is the limiting reactant:

.

Compare the value based on the two assumptions. Only the smallest value, (under the assumption that is the limiting reactant,) would resemble the theoretical yield. The reason is that would run out before all that of was converted to .

Apply the formula mass of to find the mass of that (approximately) of formula units:

.

girl imma just put my comment here because i need a couple point okurrttt