Answer:
20.91% of the hydrated calcium sulfate salt is water
Explanation:
<u>Step1</u> : Calculate the mass of H2O that evaporated
A hydrated salt has a mass of 1.803g. After heating at 170° C, this means water will evaporate, the mass of the salt is 1.426g
The difference is water that evaporated.
⇒Mass H2O of hydration =1.803 g - 1.426g g = 0.377 g H2O
<u>Step 2</u>: Calculate the % of water in the hydrated calcium sulfate salt
⇒ mass of H2O = 0.377g
⇒ mass of calcium sulfate salt = 1.803g
⇒ % water in the calcium sulfate salt = (0.377 / 1.803) x 100% = 20.91%
20.91% of the hydrated calcium sulfate salt is water
Answer:
165 g of NaCl are formed in the reaction
Explanation:
2Na + Cl₂ → NaCl
In order to determine the limiting reactant, we convert the mass of each reactant to moles
35 g / 23g/mol = 1.52 moles Na
100 g / 70.9 g/mol = 1.41 moles Cl₂
1 mol of chlorine reacts with 2 moles of Na, so If I have an x value of moles of Cl₂ I would need the double to react.
For 1.41 moles of Cl₂, I need 2.82 moles of Na; therefore my limiting reagent is the Na. Ratio is 2:2. So if I have 2.82 moles of Na I will produce 2.82 moles of NaCl
We convert the moles to mass: 2.82 mol . 58.45 g/1 mol =164.8 g
Answer:
The correct answer is option D, that is, magic numbers.
Explanation:
The magic number in nuclear physics refers to the number of nucleons, that is, either neutrons or protons, distinctly, such that their alignment results in the formation of complete shells within the nucleus of the atom. As a consequence, atomic nuclei comprising a magic number of neutrons or protons are much more stable in comparison to other nuclei.
The seven most broadly known magic numbers are 2,8,20,28,50,85 and 126.
There are no answer choices, so here are all of the non-metals:
Hydrogen, Helium, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Phosphorus, Sulfur, Chlorine, Argon, Selenium, Bromine, Krypton, Iodine, Xenon, Astatine, Radon, Tennessine, and Oganesson.
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(Please give brainliest lol)
Those areas are the coldest because there are the farthest away from the equator.
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