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bazaltina [42]
4 years ago
11

If an atom has 8 protons and 8 neutrons in its nucleus, and 8 orbiting electrons, its atomic number would be

Chemistry
1 answer:
xxTIMURxx [149]4 years ago
8 0
The atomic number is 8
Atomic number=number of proton or number of electrons
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How many grams of SnO2 are required to produce 1.20x10^21 molecules of water?
Drupady [299]

Answer:

  • <u>0.150 grams</u>

<u></u>

Explanation:

The balanced chemical reaction to obtain water from SnO₂ is:

  • SnO₂ + 2H₂ → Sn + 2H₂O

The mole ratio is:

          \dfrac{1molSnO_2}{2molH_2O}

Find the number of moles equivalent to  1.20× 10²¹ molecules of water, using Avogadro's number:

         1.20\times 10^{21}molecules\times \dfrac{1mol}{6.022\times 10^{23}molecules}=1.9927\times 10^{-3}moles

From the mole ratio, the number of moles of SnO₂ are half the number of moles of water. That is:

  • 0.0019927 moles / 2 = 0.00099635 moles of SnO₂

Use the molar mass of SnO₂ to convert the number of moles to grams:

  • molar mass of SnO₂ = 150.71g/mol
  • mass of SnO₂ = 0.00099635mol × 150.71 g/mol = 0.150 grams.

The answer must be reported with 3 significant figures.

8 0
3 years ago
If a solution has a pH of 2, what is the hydroxide ion concentration?
murzikaleks [220]

Answer:

A

Explanation:

14=pH + pOH

pOH= 14 - 2

pOH= 12

pOH= -log[OH]

[OH]= 10^-12

=1×10^-12

5 0
1 year ago
Bose-Einstein condensation occurs at what temperature?
lyudmila [28]

Bose Einstein condensation occur at temperature very close to absolute zero i.e 273.15 degrees centigrade.. Under such conditions, large quantity of Boson occupies the lowest quantum state, at which point microscopic quantum phenomena becomes apparent macroscopically.  A BEC is formed by cooling a gas of extremely low density about one hundred thousandth the density of normal air, to ultra low temperature.

4 0
3 years ago
Read 2 more answers
112,300 joules heat is transferred when 240 g of a
Flura [38]

Answer:

0.54 J/goC

Explanation:

Recall that we define the heat transferred as ;

H= mcθ

Where;

H= heat transferred = 112300J

m= mass of the metal= 240g or 0.24 Kg

c= specific heat capacity of the metal = the unknown

θ= change in temperature = (880°C-13°C) = 867°C

Substituting values and making the specific heat capacity the subject of the formula;

c= H/mθ

c= 112300/ 240×867

c= 0.54 J/goC

Hence, the specific heat capacity of the metal is 0.54 J/goC.

7 0
3 years ago
Chemical energy is released when bonds blank in a chemical reaction
Afina-wow [57]

Answer:

form

Explanation:

4 0
3 years ago
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