Change mass to moles. There are 18 grams in one mole of water.
2.45g / 18g = .14 moles of water
The heat absorbed is 40.66 kJ for each mol so
40.66 x .14 = 5.5 kJ
Mass of Aluminum = 157.5 g
<h3>Further explanation</h3>
Given
17.5 g of Hydrogen
Required
Mass of Aluminum
Solution
Reaction
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
mol Hydrogen :
= mass : molar mass
= 17.5 g : 2 g/mol
= 8.75
From the equation, mol Al :
= 2/3 x mol H₂
= 2/3 x 8.75
= 5.83
Mass Al :
= 5.83 x 27 g/mol
= 157.5 g
Both the bohr model and the quantum-mechanical model for the atom were developed in the early 1900's. These models serve to explain how electrons are arranged within the atomic structure and how the electrons affect the chemical and physical properties of each element.
Measure which mass? I recommend editing the question so that I can answer it and get more points >:)
Recrystallization is when new mineral grains form as a result of metarmorphic heat that are larger than the original mineral grains.
Recrystallization is a metamorphic process that occurs under situations of intense temperature and pressure where grains, atoms or molecules of a rock or mineral are packed closer together, creating a new crystal structure.