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cricket20 [7]
3 years ago
9

PLEASE HELP ASAP!!!!!!

Chemistry
2 answers:
wariber [46]3 years ago
5 0

Answer:

D 17 amu

Explanation:

because all you have to do is add 9+8=17 :)

Gre4nikov [31]3 years ago
4 0

The mass of the nucleus is 17 amu.

Explanation

Given :

Number of Protons = 8

Number of Neutrons = 9

To Find :

Mass of the nucleus = ?

Solution :

The mass of the nucleus  Mass= p+n

Where

p= protons in the atom

n= neutrons in the atom

So,  substituting the values

Mass= 8+9

Mass= 17 amu

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An unknown amount of mercury (II) oxide was decomposed in the lab. Mercury metal was formed and 5.20 L of oxygen was released at
Yakvenalex [24]

Answer:

  • <u>68.3g</u>

Explanation:

<u>1. Word equation:</u>

  • <em>mercury(II) oxide → mercury + oxygen </em>

<u>2. Balanced molecular equation:</u>

  • 2HgO → 2Hg + O₂(g)

<u>3. Mole ratio</u>

Write the ratio of the coefficients of the substances that are object of the problem:

       2molHgO/1molO_2

<u>4. Calculate the number of moles of O₂(g)</u>

Use the equation for ideal gases:

          pV=nRT\\\\\\n=\dfrac{pV}{RT}\\\\\\n=\dfrac{0.970atm\times5.20L}{0.08206atm.L/K.mol\times 390.0K}\\\\\\n=0.1576mol

<u>5. Calculate the number of moles of HgO</u>

         \dfrac{2molHgO}{1molO_2}\times 0.1576molO_2=0.315molHgO

<u>6. Convert to mass</u>

  • mass = # moles × molar mass

  • molar mass of HgO: 216.591g/mol

  • mass = 0.315mol × 216.591g/mol = 68.3g

7 0
3 years ago
The emission spectrum of hydrogen shows discrete, bright, colored lines. Which characteristic of the Bohr model is best supporte
natali 33 [55]
The characteristic of the Bohr model that would best support his observation is this assumption: "The energy of the electron in an orbit is proportional to its distance from the nucleus. The further the electron is from the nucleus, the more energy it has." The discrete, bright, colored lines might represent the electrons and its distance from the nucleus. The lights are caused by the energy it has.
7 0
3 years ago
Read 2 more answers
Can yall help me in this pleaseee, i dont get how im supposed to do it..​
blagie [28]
It is a triangular shape and there 26 electrons all together but when shared each individual element has 8
3 0
3 years ago
If equal masses of aluminum and copper are heated with same amount of heat, which would reach the higher temperature? Explain yo
Anestetic [448]

Answer:

copper will reach to higher temperature first.

Explanation:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

The substances with higher value of specific heat capacity require more heat to raise the temperature by one degree as compared the substances having low value of specific heat capacity.For example,

The specific heat capacity of copper is 0.386 j/g. K and for aluminium is 0.900 j/g.K. So, aluminium take a time to increase its temperature by one degree by absorbing more heat while copper will heat up faster by absorbing less amount of heat.

Consider that both copper and aluminium have same mass of 5g and change in temperature is 15 K. Thus amount of heat thy absorbed to raise the temperature is,

For copper:

Q = m.c. ΔT

Q = 5 g× 0.386 j/g K × 15 K

Q = 28.95 j

For aluminium:

Q = m.c. ΔT

Q = 5 g× 0.900 j/g K × 15 K

Q = 67.5 j

we can observe that aluminium require more heat which is 67.5 j to increase its temperature.  So it will reach to higher temperature later as compared to copper.

3 0
3 years ago
What is the temperature of 1.2 moles of Helium gas at 1950 mm Hg if it occupies 15,500 ml of volume?
n200080 [17]

Replace  with  

1950

m

m

H

g

1950mmHg and simplify.

1.2

,

1950

m

m

H

g

,

15

,

500

m

L

4 0
3 years ago
Read 2 more answers
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