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NeTakaya
3 years ago
11

Tính [H] và [OH] của dung dịch HC1 0,1M? Tính pH của dung dịch?

Chemistry
1 answer:
Brrunno [24]3 years ago
3 0

Answer:

po jakiemu to jest XD

Explanation:

po jakiemu to jest XD

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Ratling [72]

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1. c) shiny

2) True. Reactivity is a chemical property.

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3 years ago
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If the family decreases the clothing budget by 3 percent, what amount will it have to spend on clothing? Round to the nearest do
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What is there initial budget? and then take that and multiply by .3 and the. subtract that number from the original budget and you get your answer
5 0
3 years ago
The molar heat capacity of ethane is represented in the temperature range 298 K to 400 K by the empirical expression Cp,m in J K
BabaBlast [244]

Answer:

-88.66 kJ/mol

Explanation:

The expressions of heat capacity (Cp,m) for C(s) and for H₂(g) are:

C(s):  Cp,m/(J K-1 mol-1) = 16.86 + (4.77T/10³) - (8.54x10⁵/T²)

H₂(g): Cp,m/(J K-1 mol-1) = 27.28 + (3.26T/10³) + (0.50x10⁵/T²)

Cp = A + BT + CT⁻²

For the Kirchoff's Law:

ΔHf = ΔH°f + \int\limits^{T2}_{T1} {DCp(T)} \, dT

Where ΔH°f is the enthalpy at 298 K, T1 is 298 K, T2 is the temperature given (373 K), and DCp is the variation of Cp (products less reactants). ΔH°f  for ethene is -84.68 kJ/mol and the reaction is:

2C(s) + 3H₂(g) → C₂H₆

So, DCp:

dA = A(C₂H₆) - [2xA(C) + 3xA(H₂)] = 14.73 - [2x16.86 + 3x27.28] = -100.83

dB = B(C₂H₆) - [2xB(C) + 3xB(H₂)] = 0.1272 - [2x4.77x10⁻³ + 3x3.26x10⁻³] = 0.10788

dC = C(C₂H₆) - [2xC(C) + 3xC(H₂)] = 0 - (2x(-8.54x10⁵) + 3x0.50x10⁵) = 15.58x10⁵

dCp = -100.83 + 0.10788T + 15.58x10⁵T⁻²

\int\limits^{373}_{298} {-100.83 + 0.10788T + 15.58x10^5T^{-2}} \, dT = -3796.48 J/mol = -3.80 kJ/mol (solved by a graphic calculator)

ΔHf = -84.68 - 3.80

ΔHf = -88.66 kJ/mol

7 0
3 years ago
82. How many moles of calcium are in 3.82g of calcium?
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Moles= mass/Mr
Moles= 3.82/40
Moles= 0.0955 mol
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Every chlorine atom has(1) 7 electrons (2) 17 neutrons(3) a mass number of 35 (4) an atomic number of 17
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(4) an atomic number of 17
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