Answer:
0.238 millimoles
Explanation:
Given:
Mass of the table salt = 1.00 lb = 454 g
Copper(I) Iodine (cul) present in the table = 0.0100% by mass
or
Copper(I) Iodine (cul) present in the 1 pound of salt = 0.01% of 454 g
= 0.0454 grams
Molar mass of the CuI = 63.54 grams + 126.90 grams = 190.44 grams
Thus,
the number of moles of CuI present in 1 pound of salt = Mass / Molar mass
= 0.0454 / 190.44
= 2.38 × 10⁻⁴ moles
= 0.238 millimoles
Answer:
Formula is NA2SO4•10H2O
Sodium sulfate decahydrate.
Explanation:
Sodium sulfate is soluble in water. Soduim sulphare form various hydrates, so if the solution is open to the atmosphere for a week at least a lot of the water will have evaporated leaving behind a solid hydrate of Soduim sulfate.
Mass of anhydrous Na2SO4 = molar mass * number of moles
Molar mass = (23*2) + (32*1) + (16*4)
= 146 g/mol
Mass = 146*1
= 146 g of NA2SO4
NA2SO4•nH2O --> Na2SO4 + nH2O
Molar mass of hydrate, NA2SO4.nH2O
= (142 + 18n) g/mol
Mass of NA2SO4.nH2O = (142 + 18n)*1
= (142 + 18n) g
Mass of the residue = 322.2 g
Therefore, 142 + 18n = 322.2
18n = 180.2
n = 10
Formula is NA2SO4•10H2O
Sodium sulfate decahydrate.
0.0588 mol MgSO4 / 0.0588 = 1 mol MgSO4
0.412 mol H2O / 0.0588 = 7 mol H2O
Formula is MgSO4•7H2O
The answer is 3. The releasing of energy means exothermic reaction. So the ΔH should be negative. And the greatest quantity of energy released means that the greatest number. So according to the table I, the answer is 3.
The plates are<span> moving and </span>are<span> for billions of years... they collide </span>and that they<span> rip apart. The plates carry the continents on their "backs"; if </span>2<span> plates -each with a continent- collide, then a supercontinent </span>is<span> created. The </span>landmass<span> of </span>Asian nation accustomed<span> be </span>an<span> isolated block </span>concerning<span> 30-50 million years ago; it </span>1st<span> crashed into Asia </span>to form<span> the </span>range of mountains<span>. If the movement of the plates brought all the continents </span>along once more<span>, </span>one<span> continent would </span>type<span>. At </span>the instant<span> plate, movements </span>aren't<span> heading </span>in this direction<span>.</span>