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3 years ago

Reset the periodic table and highlight period 3. Record the number of solids, liquids, and gases found in this period???

Chemistry

1 answer:

Arlecino [84]3 years ago

4 0

<h3>Refer to the attachment!!</h3>

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What is the alkaline earth metal with the largest atomic number

frez [133]

Radium, which has an atomic number of 88. The Alkaline earth metals are in the second column of the Periodic Table. Hope this helps!

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3 years ago

Read 2 more answers

Using standard heats of formation, calculate the standard enthalpy change for the following reaction. 2NH3(g) 3N2O(g)4N2(g) 3H2O

trasher [3.6K]

Answer: $\Delta H^{0} = -879.15 kJ/mol$

Explanation: Heats of formation is the amount of heat necessary to create 1 mol of a compound from its molecular constituents. The basic conditions the substance is formed is at standard conditions: 1 atm and 25°C. Each compound has its own heat of formation per mol of compound (kJ/mol), but to an element is assigned a value of zero.

Standard Enthalpy Change is defined as the heat absorbed or released when a reaction takes place. It can be positive or negative, which means reaction is endothermic or exothermic, respectively.

Enthalpy change is calculated as the difference between the sum of heat formation of products and the sum of heat formation of the reactants:

$\Delta H^{0}=\Sigma H^{0}_{f}_{(products)}-\Sigma H^{0}_{f}_{(reactants)}$

For the reaction

2NH₃ + 3N₂O → 4N₂ + 3H₂O

2(-46.2) + 3(82.05) 4(0) + 3(-241.8)

$\Delta H^{0}=3(-241.8)-[ 2(-46.2)+3(82.05)]$

$\Delta H^{0}=-725.4-153.75$

$\Delta H^{0}=-879.15$

The standard enthalpy change for the reaction is $\Delta H^{0}=-879.15$ kJ

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3 years ago

What is PO3 compound name?

OleMash [197]

Answer:

PHOSPHITE ION is the correct answer.

Explanation:

Hope this helped Mark BRAINLIEST!!!

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3 years ago

Which layer of the atmosphere is between the mesosphere and the exosphere?

Genrish500 [490]

C. Thermosphere is the correct answer

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2 years ago

Write a hypothesis to predict how reaction rate will change when temperature changes. For example: “ If i heat a reaction, then

cricket20 [7]

If I heat a reaction then the rate will increase because the higher the temperature the faster the reaction.

Please vote my answer brainliest. thanks!

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3 years ago