1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Degger [83]
3 years ago
5

I need help on 18b. i’m confused on how you would work it.

Chemistry
1 answer:
AfilCa [17]3 years ago
4 0
For a and b, you need to divide it by Avogadro’s number to find the answer.

a. (6.022x10^23)/6.022x10^23 = 1 mole of Ne
b. (3.011x10^23)/6.022x10^23 = 0.5 moles of Mg

For c and d, you’ll use the mass provided divided by the molar mass to find the number of moles.
Pb molar mass = 207.2 g/mol

c. (3.25x10^5)/207.2 = 1.57x10^3 moles of Pb
For d, I can’t tell if is Cu, C or something else but you can follow the steps above to solve the problem.
You might be interested in
Ima Chemist found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental conditions. Her measurements showed that
PIT_PIT [208]

If we assume this two gases behave like ideal gas, then we use the ideal gas law PV=nRT, where P is the pressure, V is the volume, n number of moles, R gas constant and T the temperature in kelvins. As well as the density formula D=\frac{m}{V}. First we calculate the molarity for Freon

CFCl_3 = (12+ 18.998 + 3 \times 35.453) =137.36\ g/mol.

The number of moles for freon are

D=\frac{m}{V} =\frac{ nM}{L} \implies n= \frac{DL}{M} = \frac{5.58 g \times L}{L \times 137.36g/mol}= 0.0406 mol

We know n=\frac{m}{M}, so we insert this concept to our ideal gas equation

PV=n \times RT=\frac{m}{M} \times RT= \frac{mRT}{M}. Since D=\frac{m}{V}, we insert this concept to the formula

PV=\frac{mRT}{M} \\P=\frac{mRT}{VM} = \frac{DRT}{M} \\\\\implies M= \frac{DRT}{P}. The measurements take place in same conditions so,

M=\frac{DRT}{P} = \frac{4.38g}{L}\times \frac{1L}{0.0406mol} = 107.9\ g/mol

3 0
3 years ago
Unsa ang karaan nga duwa saonang panaho​
melamori03 [73]

Answer:

Ang kasaysayan ng mga laro ay nagmula sa sinaunang nakaraan ng tao. Ang mga laro ay isang mahalagang bahagi ng lahat ng mga kultura at isa sa pinakamatandang anyo ng pakikipag-ugnay sa lipunan ng tao. Ang mga laro ay gawing pormal na pagpapahayag ng paglalaro na nagpapahintulot sa mga tao na lumampas sa agarang imahinasyon at magdirekta ng pisikal na aktibidad. Kasama sa mga karaniwang tampok ng mga laro ang kawalan ng katiyakan sa kinalabasan, napagkasunduang panuntunan, kumpetisyon, magkakahiwalay na lugar at oras, mga elemento ng kathang-isip, mga elemento ng pagkakataon, iniresetang mga layunin at personal na kasiyahan.

Nakukuha ng mga laro ang mga ideya at pananaw sa mundo ng kanilang mga kultura at ipinapasa sa hinaharap na henerasyon. Ang mga laro ay mahalaga bilang mga kaganapan sa pagbubuklod ng kultura at panlipunan, bilang mga tool sa pagtuturo at bilang mga marka ng katayuan sa lipunan. Bilang pampalipas ng oras ng pagkahari at ng mga piling tao, ang ilang mga laro ay naging karaniwang tampok ng kultura ng korte at binigyan din bilang mga regalo. Ang mga larong tulad ni Senet at ang Mesoamerican ball game ay madalas na pinuno ng mitiko at ritwal na relihiyosong kahalagahan. Ang mga larong tulad ng Gyan chauper at The Mansion of Happiness ay ginamit upang magturo ng mga aralin na pang-espiritwal at etikal habang sina Shatranj at Wéiqí (Go) ay nakita bilang isang paraan upang mapaunlad ang madiskarteng pag-iisip at kasanayan sa kaisipan ng mga elite sa politika at militar.

3 0
3 years ago
It takes 486.0 kJ/mol to convert sodium atoms to Na+ ions. Sodium atoms absorb and emit light of wavelengths 589.6 and 590.0 nm.
solmaris [256]
We first calculate the energy contained in one photon of this light using Planck's equation:

E = hc/λ

E = 6.63 x 10⁻³⁴ x 3 x 10⁸ / 590 x 10⁻⁹
E = 3.37 x 10⁻²² kJ/photon

Now, one mole of atoms will excite one mole of photons. This means that 6.02 x 10²³ photons will be excited

(3.37 x 10⁻²² kJ/photon) x (6.02 x 10²³ photons / mol)

The energy released will be 202.87 kJ/mol
8 0
3 years ago
Iron is obtained commercially by the reaction of hematite (Fe2O3) with carbon monoxide. How many grams of iron are produced if 1
kherson [118]
 <span>CO is the limiting reactant 
( 25.0 x 3 = 75 moles of CO are required) 

Moles Fe = 30.0 x 2 / 3 = 20.0 
mass Fe = 20.0 x 55.847 g/mol=1117 g </span><span>

I'm just saying</span>
5 0
4 years ago
What is the density if<br> a sample of rock has a mass of 69<br> g and a volume of<br> 23<br> ml?
kiruha [24]
Density = mass / volume

= 69g / 23 ml

= 3 g / ml.

Thus, the density of the sample is 3 grams per ml or 3g/ ml
4 0
4 years ago
Read 2 more answers
Other questions:
  • Evan finds a rock while hiking. It has a fossil in it. The rock is most likely a(n):
    12·2 answers
  • Many manufacturing processes involve chemical reactions that reach equilibrium. Why would chemists adjust conditions to favor th
    5·2 answers
  • 3. Two or more substances that are not
    6·1 answer
  • Which statements describe phase changes? Check all that apply.
    12·2 answers
  • Attached are two chemistry questions I need help with. thank you to whoever helps me out
    11·1 answer
  • When data does not support your hypothesis in an experiment, you must revise what
    15·1 answer
  • 1) Which of the following is an example of an endothermic process?
    6·2 answers
  • Kevin left his house and walked 1 block east to the bus stop. He got on the bud, which he rode to the store. Which point of refe
    5·2 answers
  • Given : 4.50 molte
    13·1 answer
  • Suppose you have a compound which has an empirical formula of C4H5N2O and molar mass of 194 g/mol. What is the compounds molecul
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!