What is the identity and charge of this ion?

Question

In an ion with an unknown charge, the total mass of all the electrons was determined to be 2.19 ✕ 10⁻²⁶ g, while the total mass of its protons was 4.34 ✕ 10⁻²³ g. What is the identity and charge of this ion? (Enter your answer in the form X^q±.)

Answer 1

assuming your instructor wishes you to use 1.673 x 10^-24 g for the standard mass of a proton, and 9.109 x 10^-28 kg for the standard mass of an electron

2.19 x 10^-26 g total mass of electrons / 9.109 x 10^-28 g per electron = 24 (round to the nearest whole number since we can't have fractional electrons)

4.34 x 10^-23 g total mass of protons / 1.673 x 10^-24 g per proton = 26 protons.

Atomic # 26 corresponds to Iron. Since there are 2 less electrons than protons, this is a 2+ iron cation.

Fe²⁺