Explanation: 1- we will get the mass of the reacting gold: volume of gold = length * width * height volume of gold = 3.2 * 3.8 * 2.8 = 34.048 cm^3 = 34.048 ml<span> density = mass / volume Therefore: mass = density * volume mass of gold = </span>19.3 * 34.048 = 657.1264 grams
2- we will get the number of moles of the reacting gold: number of moles = mass / molar mass number of moles = 657.1264 / 196.96657 number of moles = 3.3362 moles
3- we will get the number of moles of the HCl: First, we will balanced the given equation. The balanced equation will be as follows: Au + 2HCl ......> AuCl2 + H2 This means that one mole of Au reacts with 2 moles of HCl. Therefore 3.3362 moles will react with 2*3.3362 = 6.6724 moles of HCL
4- we will get the mass of the HCl: From the periodic table: molar mass of H = 1 gram molar mass of Cl = 35.5 grams Therefore: molar mass of HCl = 1 + 35.5 = 36.5 grams/mole number of moles = mass / molar mass Therefore: mass = number of moles * molar mass mass of HCl = 6.6724 * 36.5 mass of HCl = 243.5426 grams
Gravitational potential energy is due to the position of an object above Earth's surface. The object has the potential to fall due to gravity. Gravitational potential energy depends on an object's weight and its height above the ground (GPE = weight x height).
