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Elanso [62]
3 years ago
13

Earlier in the lesson, you determined that the enthalphy for magnesium combustion could be computed using Hess’s law. The formul

a derived from the reaction equations was:
Delta H shown in orange equals delta H 1 in green minus delta H 2 in purple plus delta h 3 in blue.

The enthalpy of the magnesium combustion is
kJ/mol.
Chemistry
2 answers:
Musya8 [376]3 years ago
4 0

Answer:

look at pic

Explanation:

.kjkj;lkm'

kvv77 [185]3 years ago
3 0

Answer:

-655 kj/mol

Explanation:

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24.0 mL of a 0.120 M Ca(OH)2 solution is required to titrate 160 mL of an HCl solution to its equivalence point. Find the moles
Alex787 [66]
T<span>he balanced reaction is as follows;
Ca(OH)</span>₂<span> + 2HCl ---> CaCl</span>₂<span> + 2H</span>₂<span>O
  stoichiometry of Ca(OH)</span>₂<span> to HCl is 1:2
number of moles of Ca(OH)</span>₂<span> reacted = 0.120 mol/L x 0.0240 L = 0.00288 mol according to molar ratio of 1:2 number of HCl moles reacted = twice the number of Ca(OH)</span>₂<span> moles reacted
number of HCl moles reacted = 0.00288 mol x 2 = 0.00576 mol
number of HCl moles in 160 mL - 0.00576 mol
therefore number of HCl moles in 1000 mL - 0.00576 mol / 160 mL x 1000 mL = 0.036 mol
molarity of HCl = 0.036 M</span>
7 0
3 years ago
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If you drop a 50 gram piece of metal with a temperature of 125° Celsius into 1000 grams of water at 20° Celsius, what best descr
Nostrana [21]
Dropping a 50 gram piece of metal with a temperature of 125° Celsius into 1000 grams of water at 20° Celsius would lead to a heat loss by the metal and an heat gain by the water. These loss and gain should be equal since energy cannot be created nor destroyed.
3 0
3 years ago
What is the arrangement of the electrons in the sub-orbitals of the element Br?
melamori03 [73]

Answer:35 electrons

Bromine atoms have 35 electrons and the shell structure is 2.8. 18.7. The ground state electron configuration of ground state gaseous neutral bromine is [Ar

Explanation:

4 0
3 years ago
What is the symbol of the element that is classified as an alkali metal and is in period 4?
djyliett [7]

Answer:

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3 years ago
Which of the following statements regarding enzymes is FALSE? a. Enzymes alter the free energy change (ΔG) of the reactions whic
const2013 [10]

Answer:

Enzyme function is dependent on the three-dimensional structure or conformation of the enzyme

Explanation:

Enzyme are biological catalysts.

So they do alter the path of the reaction where the free energy change (or activation energy) is low then the non enzymatic pathway.

Thus the statement

Enzymes alter the free energy change (ΔG) of the reactions which they catalyze : True

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Enzyme function is dependent on the pH and temperature of the reaction environment: true

This is also true that

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The false statement is : Enzyme function is dependent on the three-dimensional structure or conformation of the enzyme

6 0
3 years ago
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