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Ierofanga [76]
3 years ago
14

How many atoms are in ErAg

Chemistry
1 answer:
Semmy [17]3 years ago
3 0
6.022 * 10^23 atoms
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Decaying plants and animals are important to an ecosystem because they
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The option D is correct answer.

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3 years ago
Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction: P4(g) + 10 Cl2(g) → 4PCl5(s) ΔH
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Answer: -1835 kJ

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to Hess’s law, the chemical equation can be treated as algebraic expressions and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

PCl_5(s)\rightarrow PCl_3(g)+Cl_2(g)  \Delta H_1=+157kJ (1)

P_4(g)+6Cl_2\rightarrow 4PCl_3(g)  \Delta H_2=-1207J (2)

Net chemical equation:

P_4(g)+10Cl_2(g)\rightarrow 4PCl_5(s)  \Delta H=? (3)

Multiplying equation (1) by 4,  and reversing we get

4PCl_3(g)+4Cl_2(g)\rightarrow 4PCl_5(s)  \Delta H_4=4\times -157kJ=-628kJ (4)

Adding (2) and (4)

P_4(g)+10Cl_2(g)\rightarrow 4PCl_5(s)  \Delta H_3=\Delta H_2+\Delta H_4=-1207kJ-628kJ=-1835kJ  

Thus enthaply change for the reaction is -1835 kJ.

3 0
4 years ago
0.350g of an organic compound gave 100ml of Nitrogen collected at
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The percentage composition of Nitrogen in the compound is 35.71%

<h3>How to determine the mole of nitrogen</h3>
  • Volume (V) = 100 mL = 100 / 1000 = 0.1 L
  • Pressure (P) = 700 mmHg
  • Temperature (T) = 250 K
  • Gas constant (R) = 62.364 torr.L/Kmol
  • Number of mole (n) =?

Using the ideal gas equation, the mole of nitrogen can be obtained as follow

PV = nRT

n = PV / RT

n = (700 × 0.1) / ( 62.364 × 250)

n = 0.00448 mole

<h3>How to determine the mass of nitrogen</h3>
  • Mole of nitrogen = 0.00448 mole
  • Molar mass of nitrogen = 28 g/mol
  • Mass of nitrogen = ?

Mass = mole × molar mass

Mass of nitrogen = 0.00448 × 28

Mass of nitrogen = 0.125 g

<h3>How to determine the percentage of nitrogen</h3>
  • Mass of nitrogen = 0.125 g
  • Mass of compound = 0.35 g
  • Percentage of nitrogen =?

Percentage = (mass of element / mass of compound) × 100

Percentage of nitrogen = (0.125 / 0.35) × 100

Percentage of nitrogen = 35.71%

Learn more about mass composition:

brainly.com/question/11617445

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The characteristics of an air mass depend mainly upon the
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Surface over which the air mass was formed.

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