A substance that contains two or more kinds of atoms is a molecule.

<u>A</u><u>)</u><u> </u><u>The moles of NaOH are equal to moles of HCl.</u>
Explanation:
NaOH + HCl ↦NaCl + H20
Answer:
There are 6.022 × 1023 atoms of potassium in every mole of potassium. Since one mole of KOH contains one mole of K, the answer is 6.022×1023 atoms of K.
Explanation:
The relationship between the mole and the mass of an element is given by this equation: mass in grams = moles * molar mass of iron
mass of iron needed = 2.5 * 56 = 140g.
Therefore, 140g of iron is needed.
I think the correct answer from the choices listed above is option B. When more sulfur trioxide gas is added to the reaction mixture, then the equilibrium will shift toward the reactants. Hope this answers the question. Have a nice day. Feel free to ask more questions.