Answer:
0.3758moles
Explanation:
moles of kcl = mass of kcl/ molar mass of kcl = 28/74.5 = 0.3758moles
<u>Answer</u>
657nm
Explanation
wavelength= 1/wavenumber
but wavenumber = RH×Z^2( (1/n1^2)-(1/n2^2))
where RH is the Rydberg constant = 1.0976×10^7
Z is the atomic number
n1 & n2 are orbitals
=(1.0976×10^7)×(1^2)×(1/4-1/9)
=1524444.444
but wavelength= 1/wavenumber
Therefore wavelength = 1/1524444.444
= 6.5597× 10^-7m
≈ 657nm
Answer:Boiling point of a solution is found to be 100.34
o
C. Boiling point of pure
water is 100
o
C.
The elevation in the boiling point ΔT
b
=100.34−100=0.34
o
C.
12 gm glucose (molecular weight 180 g/mol) is dissolved in 100 gm water.
The number of moles of glucose =
180g/mol
12g
=0.0667mol
Mass of water =100g×
1000g
1kg
=0.100kg
Molality of solution m=
0.100kg
0.0667mol
=0.667mol/kg
The elevation in the boiling point ΔT
b
=K
b
×m
0.34
o
C=K
b
×0.667mol/kg
K
b
=0.51
o
Ckg/mol
The molal elevation constant for water is 0.51
o
Ckg/mol.
Explanation:
Answer: determines the age of sample Carbon-14 is used in radiocarbon dating and radiolabeling. Medically important, a radioactive isotope is carbon-14, which is used in a breath test to determine the ulcer-causing bacteria Heliobacter pylori
The radiocarbon age of a certain sample of unknown age can be determined by measuring its carbon 14 content and comparing the result to the carbon-14 activity in modern and background samples.
The R was found to be = 0.6711 L atm/mol.K
The percent error was found to be =18.22 %
<h3>How come magnesium is a metal?</h3>
The three elements that form magnesium a metal are as follows: It effectively conducts electricity. An electropositive element is magnesium. Magnesium has a relatively low ionization enthalpy.
<h3>Where can one find magnesium metal?</h3>
In the crust of the planet, magnesium is the seventh most prevalent element. It is found in huge amounts as magnesite, dolomite, and other minerals but does not naturally occur uncombined.
<h3>What applications does magnesium have?</h3>
- Magnesium supports muscle and neuron function as well as energy synthesis in the body, among many other vital functions.
- Typically, low magnesium levels don't result in any symptoms.
- On the other hand, persistently low levels can raise your risk of osteoporosis, type 2 diabetes, high blood pressure, and heart disease.
learn more about Magnesium here
<u>brainly.com/question/27631695</u>
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