Answer:
28 grams CaH₂(s) is required for production of 15L H₂(g) at 25°C and 825Torr.
Explanation:
CaH₂(s) + H₂O(l) => Ca(OH)₂(s) + H₂(g)
Using ideal gas law, PV = nRT
=> moles H₂(g) = PV/RT = [(825/760)Atm](15L)/(0.08206L·Atm·mol⁻¹·K⁻¹)(298K) = 0.6659 mol H₂(g)
From stoichiometry of given equation,
=> 0.6659 mol H₂(g) requires 0.6659 mole CaH₂(s)
Converting moles to grams, multiply by formula weight,
=> 0.6659 mole CaH₂(s) = 0.6659 mole CaH₂(s) x 42g/mole = 27.966 grams CaH₂(s) ≅ 28 grams CaH₂(s) (2 sig. figs.)
A) K and Br
Ionic compounds are compounds in which mostly a metal and non-metal bond. Potassium (K) is a metal and Bromine (Br) is a non-metal.
Explanation:
My physiological make-up that governs the attributes I have and my climate, i.e. the conditions I have, are the variables influencing my limits. Biological make-up also regulates my prospects when they depend on my attributes, i.e. my ability and my environment , i.e. the conditions under which I am. This has been shown by experiments on twins, that our limits and opportunities are controlled by both genetics and environment.
Explanation:
Conduction is a heat transfer method or movement of electricity without the movement of the materials of the medium.
- Metals are said to be good conductor of heat and electricity due to their structure.
- In electrical conduction, a metal or substance uses free mobile electrons to transfer electricity.
- In heat conduction, molecules that makes up a solid begins to vibrate against one another when heated
- The vibration leads to an increase in kinetic energy between two bodies.
- As this occurs, there is a transfer of heat energy from one body to another.
Learn more:
Heat transfer from the sun brainly.com/question/1140127
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The number of moles : n = 4.95 x 10 ²⁴
<h3>Further explanation</h3>
Given
2.98E28 molecules of water
Required
The number of moles
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
n = N : No
n = 2.98 x 10²⁸ : 6.02.10²³
n = 4.95 x 10 ²⁴