If 250g of iron react with oxygen gas to produce iron (iii) oxide, how many moles of oxygen gas will be needed?

= 3.358 moles

Explanation:

Iron react with oxygen to form iron(iii) oxide according to the following reaction;

4Fe(s) +3O2(g) → 4Fe2O3(S)

Moles of Iron in 250 g is;

= 250 g/55.845 g/mol

= 4.477 moles

Using mole ratio; Iron : oxygen = 4 : 3

Moles of oxygen gas = 4.477 × 3/4

                                   = 3.358 moles

Therefore. it means 3.358 moles of oxygen gas are required to react with 250 g of iron to form iron (ii) oxide.

"a connection, a bond or common feeling between two people", or as a chemical process it stimulates love or sexual attraction

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.