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olga nikolaevna [1]
3 years ago
9

Helium, neon, and argon are examples of

Chemistry
2 answers:
IceJOKER [234]3 years ago
5 0

c noble gas i answered it, and i got it right


iogann1982 [59]3 years ago
4 0
C) Noble gases
The six noble gases are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Their atomic numbers are, respectively, 2, 10, 18, 36, 54, and 86.
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A 1 m ID spherical cooler made of 2 cm thick foam insulation (k = 0.15 Wm-1K-1) is used to store iced water at 0°C. The tank is
Leto [7]

The answer is unknown

3 0
3 years ago
What is the volume of 7.50x10^24 molecules of NH3 at STP
Bas_tet [7]

Answer:

V NH3 = 304.334 L

Explanation:

  • 1 mol ≡ 6.02 E23 molecules

⇒ moles NH3 = (7.50 E24 molecules)×(mol/6.022 E23 molecules)

⇒ mole NH3 = 12.454 mol

assuming ideal gas:

  • PV = RTn

STP:

∴ T = 25°C ≅ 298 K

∴ P = 1 atm

⇒ V NH3 = RTn/P

⇒ V NH3 = ((0.082 atm.L/K.mol)×(298 K)×(12.454 mol))/(1 atm)

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4 0
4 years ago
What is the change in heat energy when 132g of copper at 32.2°C is raised to 45.0oC? The specific heat of copper is 0.385 J/g °C
Rudik [331]
Heat energy can be calculated by using the specific heat of a substance multiplying it to the mass of the sample and the change in temperature. It is expressed as: 
<span>
Energy = mCΔT
</span><span>Energy = 132 (0.385) (45 - 32.2)
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4 0
3 years ago
Assume that magnesium would act atom-for-atom the same as copper in this experiment. How many grams of magnesium would have been
Goshia [24]

Answer:

0.1127 grams of Mg is used to produce one gram of silver

Explanation:

Write a balanced equation

Mg(s) +2Ag + (aq) --> Mg^{2+}(aq) + 2Ag(s)

The atomic mass of magnesium is 24.31 g/mol and the atomic mass of silver is 107.84g/mol

1 g Ag of silver is produced from [(1 mol Mg)(24.31 g/mol)] /[ (2mol Ag)(107.84g/mol)]

1 g Ag of silver is produced from 0.1127 grams of Mg

0.1127 grams of Mg is used to produce one gram of silver

7 0
4 years ago
What is the molecular geometry of PBr5? Draw its VSEPR and Lewis structure.
Vikentia [17]
The molecular geometry is trigonal bipyramidal.

3 0
4 years ago
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