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jek_recluse [69]
3 years ago
13

Metallic barium crystallizes in a body-centered cubic lattice, with one Ba atom per lattice point. If the metallic radius of Ba

is 217 pm, what is the volume of the unit cell in pm3 and in cm3?
Chemistry
1 answer:
Tema [17]3 years ago
3 0

Answer:

1.26 x 10⁸pm³ and 1.26 x 10⁻²²cm³

Explanation: Calculating for a body centered cubic lattice, the formula is

3d²= 16r²

where d =  edge length of unit cell

r=radius of atom

3d²= 16 x (217)²

3d²=753424

d²=251141.3

d= 501.1pm

volume of unit cell= d³= (501.1)³= 1.26 x 10⁸pm³

converting to cm³= 1.26 x 10⁸(10⁻¹²m)³

=1.26 x 10⁸(10⁻¹⁰cm)³ = 1.26 x 10⁻²²cm³

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0.75 moles of an unknown acid are dissolved in water. If 0.42 moles of H3O+ form, what was the percent dissociation of the unkno
AnnZ [28]

Answer:

56 %

Explanation:

The percent dissociation of a weak acid can be defined as:

Moles of weak acid that produced H₃O⁺ species / Total number of weak acid moles * 100%

We are given all the required data to <u>calculate the percent dissociation</u>:

0.42 mol / 0.75 mol * 100 % = 56 %

The percent dissociation is 56%.

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3 years ago
Ill mark brainliness just please help :( science suck
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I really don’t know but I’d guess city s
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1,4-Pentadiene has a AHhydro = -254 kJ/mol while trans-1,3-pentadiene has a AHhydra = -226 kJ/mol. Explain this difference in he
julsineya [31]

Answer:

trans-1,3-pentadiene is more stable than 1,4-pentadiene due to presence of a conjugated double bond.

Explanation:

Here, \Delta H_{hydro}=H(hydrogenated pdt.)-H(diene)

H(hydrogenated pdt.) is same for both 1,4-pentadiene and 1,3-pentadiene as they both produce pentane after hydrogenation

H(diene) depends on stability of diene.

More stable a diene, lesser will be it's H(diene) value (more neagtive).

trans-1,3-pentadiene is more stable than 1,4-pentadiene due to presence of a conjugated double bond.

Hence, \Delta H_{hydro} is higher (less negative) for trans-1,3-pentadiene

5 0
4 years ago
Which of the following will lower the rate of reaction? (there are 2 answers to select)
miskamm [114]

Answer:

B. Adding an enzyme to the reaction

D. decreasing the concentration of a reactant.

5 0
3 years ago
How many moles of acetylene are needed to completely react with 16.5g of CO2
kykrilka [37]

Answer:

0.375 mols

Explanation:

  1. Relative atomic mass Ar of C=12×1=12
  2. Relative atomic mass Ar of O=16×2=32
  3. Realitive formula mass Mr is 12+32=44

mol:mass

1 : 44

x :16.5

cross multiply and get the answer

5 0
3 years ago
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