If 3.0 moles of a and 4.0 moles of b react according to the hypothetical reaction below, how many moles of the excess reactant will be left over at the end of the reaction? a + 2b → ab2

1.0 mol of A should be left over.

Explanation:

We have the balanced equation:

That means that I need 1.0 mol of A for each 2.0 moles of B to obtain 1.0 mol of

Now, we have 3.0 moles of A and 4.0 moles of B reacting, so:

3.0 moles of A . = 3.0 moles of

4.0 moles of B . = 2.0 moles of

That means that with 3.0 moles of A and 4.0 moles of B, we can form 2.0 moles of and 1.0 mole of A should be left over.

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.