A chemist is studying a sample of liquid ethanol (C₂H₅OH) which has a molecular mass of 46 u. If the chemist has a 1.4 liter sample of this ethanol, how many protons are present within this volume?

Two tiny iron balls to be used in an electrostatics experiment have a mass of 0.0550 kg each. The balls are placed 65.0 cm apart. Determine the number of electrons on each neutral ball. (Iron has an atomic mass of 55.85 g/mol and atomic number 26)

Determine the mass of Silver (atomic number 47) having a total nuclear charge of 3.5 C.

Two protons are released from rest at a separation distance of approximately one atomic diameter, equal to 1.0 × 10^-10 m, from each other in vacuum space. Find the magnitude of their initial acceleration. [Hint: A proton has mass m_p = 1.67 × 10^-27 kg, charge = 1.60×10^-19 C, and The Coulomb's constant k = 8.99 × 10⁹ N⋅m²/C².]

Imagine that you are studying a massive block of pure iron that weighs around 5 kilograms. You are aiming to calculate the total negative charge of all electrons found inside of this block. Additionally, you need to determine the overall electrical neutrality of this particular block. Note that Iron has a atomic weight of approximately 56 atomic mass units per mole, and contains 26 electrons per atom. 

A student rubs a rubber balloon against her hair. In turn, the charge gained by the balloon is -1.2 microcoulomb. How many electrons are transferred from the student's hair to the balloon?