If I understand this right, the two elements are Nickel and Copper, elements 28 and 28, respectively. A nickel is worth 5 cents, and a penny, originally comprised of copper, is worth one - the total being six cents.
Answer:
The molar mass and molecular weight of 3CaCl2 is 332.952.
The second one, b synthesis reaction
Li2O is the formula for <span> lithium oxide</span>
