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natima [27]
3 years ago
5

Name the first 20 elements on the periodic table

Chemistry
2 answers:
Sergeu [11.5K]3 years ago
8 0

Answer:

1HydrogenH2HeliumHe3LithiumLi4BerylliumBe5BoronB6CarbonC7NitrogenN8OxygenO9FluorineF10NeonNe11SodiumNa12MagnesiumMg13AluminiumAl14SiliconSi15PhosphorusP16SulfurS17ChlorineCl18ArgonAr19PotassiumK20CalciumCa

Helga [31]3 years ago
6 0

Answer:

  1. HYDROGEN
  2. HELIUM
  3. LITHIUM
  4. BERYLLIUM
  5. BORON
  6. CARBON
  7. NITROGEN
  8. OXYGEN
  9. FLUORINE
  10. NEON
  11. SODIUM
  12. MAGNESIUM
  13. ALUMINUM
  14. SILICONE
  15. PHOSPHORUS
  16. SULFUR
  17. CHLORINE
  18. ARGON
  19. POTASSIUM
  20. CALCIUM

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What would be the change in pressure in a sealed 10.0 l vessel due to the formation of n2 gas when the ammonium nitrite in 2.40
larisa86 [58]

The  change  in pressure in a sealed 10.0L vessel  is 5.28 atm

<u><em>calculation</em></u>

The pressure is calculated using the ideal gas equation

That is   P=n RT

where;

P (pressure)= ?

v( volume) = 10.0 L

n( number of moles)  which is calculated as below

<em>write the equation  for  decomposition  of   NH₄NO₂</em>

NH₄NO₂  →  N₂  +2H₂O

<em>Find the moles of NH₄NO₂</em>

 moles = molarity x volume in liters

= 2.40 l x 0.900 M =2.16 moles

<em>Use the mole ratio to determine the  moles of N₂</em>

that is from equation above  NH₄NO₂:N₂ is 1:1 therefore the moles of N₂ is also =2.16 moles

R(gas constant) =0.0821 l.atm/mol.K

T(temperature)  = 25° c  into kelvin = 25 +273 =298 K

make p the  subject of the formula  by diving both side  by  V

P = nRT/V

p ={ (2.16 moles x 0.0821 L.atm/mol.K  x 298 K) /10.0 L} = 5.28  atm.




3 0
3 years ago
Read 2 more answers
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