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3 years ago

0.378 mL + 42.3 mL - 1.5833 mL

Chemistry

1 answer:

Juli2301 [7.4K]3 years ago

4 0

That equals to 41.0947mL

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The ka of phosphoric acid, h3po4, is 7.6  10–3 at 25 °c. for the reaction h3po4(aq) h2po4 – (aq) + h+ (aq) ∆h° = –14.2 kj/mol.

blsea [12.9K]

<span>Use the van't Hoff equation: ln ( K2 K1 ) = Î” HÂş R ( 1 T1 â’ 1 T2 ) ln ( K2 7.6*10^-3 ) = -14,200 J 8.314 ( 1 298 â’ 1 333 ) ln ( K2 7.6*10^-3 ) = â’ 1708 ( 0.00035 ) ln ( K2 0.0076 ) = â’ 0.598 Apply log rule a = log b b a -0.598 = ln ( e â’ 0.598 ) = ln ( 1 e 0.598 ) Multiply both sides with e^0.598 K 2 e 0.598 = 0.0076 K e 0.598 e 0.598 = 0.0076 e 0.598 K 2 = 0.0076 e 0.598 = 4.2 â‹… 10 â’ 3 K2 = 4.2 â‹… 10 â’ 3</span>

7 0

3 years ago

Complete them with correct formulas<br> Then balance them

otez555 [7]

Answer:

1. 2Ca + N $_{2}$ → 2CaN

2. 4Li + O $_{2}$ → 2Li $_{2}$ O

3. 2KCl + BaF $_2$ → 2KF + BaCl $_2$

4. CH $_4$ + 2O $_2$ → CO $_2$ + 2H $_2$ O

Be sure to balance the number of atoms on both sides of each equation only by adding coefficients to the compounds!!!! Those without a coefficient are meant to have a coefficient of 1.

4 0

2 years ago

The heisenberg uncertainty principle status that

Juli2301 [7.4K]

The Heisenberg uncertainty principle listed above states that it’s impossible to determine with high precision both the momentum and position of an electron simultaneously.

8 0

3 years ago

What mass of KCl is required to make a 0.680 m solution with 5.00 kg of water? a) 199 g b) 548 g c) 253 g d) 373 g

sladkih [1.3K]

Answer:

it is A.

Explanation:

A.) 199g

5 0

3 years ago

Mg + 2H20 + Mg(OH)2 + H2 + 353kJ

mixer [17]

Answer:

$m_{H_2O}=8.9g$

Explanation:

Hello,

Based on the given reaction, since magnesium and water are in a 1:2 molar ratio at the reactants, we must apply the following stoichiometric factors to compute the complete reaction of the 6.0 g of magnesium:

$m_{H_2O}=6.0gMg*\frac{1molMg}{24.305 gMg}*\frac{2molH_2O}{1molMg} *\frac{18gH_2O}{1molH_2O} \\\\m_{H_2O}=8.9g$

Best regards.

7 0

3 years ago