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abruzzese [7]
2 years ago
6

Avogadro’s number was calculated by determining the number of atoms in 12.00 g of carbon-12. 14.00 g of carbon-12. 12.00 g of ox

ygen. 14.00 g of oxygen.
Chemistry
2 answers:
OLga [1]2 years ago
8 0

Answer:

Avogadro’s number was calculated by determining the number of atoms in 12.00 g of carbon-12.

Explanation:

The number of particles presents in one mole of a substance is known as Avogadro's number.

Avogadro's number is 6.022\times10^2^3 atoms or molecules or ions or particles present in one mole of a substance. It is denoted by the symbol L or N_A.  It is a dimensionless quantity.

Avogadro's number was proposed by Jean Perrin but named in the honor of italian scientist Amedeo Avogadro.

Avogadro's number is the number of atoms present in 12 grams of carbon-12.

bogdanovich [222]2 years ago
7 0

Answer:

The answer is A.

Explanation:

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Answer:

B, D

Explanation:

The strategy here is to realize that the ice will be taken from -6.5 ºC to OºC where it will melt.

Lets call q₁ the heat required to bring the ice to 0ºc, q₂ the heat required to bring the phase change from solid to liquid.

q₁ is calculated from the expression

q₁ = s x m x ΔT where m is the mass, s the specific heat of ice ( 2.09 J/gºC ) and ΔT  the change in temperature.

q₂ the fusion enthalpy change   is calculated from the expression:

q₂ = C x ΔT

where C is the specific heat for the phase change , in this case named AH  given in kJ/mol.

We are given all the data needed to calculate q₁, q₂ and qtotal ( q₁ + q₂ )

q₁ = 25.0 g x ( 2.09 J/gºC) x ( 0 - ( -6.5 ºC ) )

q₁ = 339.6 J = 0.339 kJ

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qtotal = 0.339 kJ + 8.36 kJ = 8.70 kJ

with these calculations, we can now proceed to answer the question:

(a) False AH is theheat capacity for the melting.

(b) True as we determined above

(c) False we only have one phase change, from solid (ice) to liquid

(d) True as calculated above

(e) False as determined in our calculations

7 0
2 years ago
Sodium (chemical symbol Na) is atomic number 11 and is in the first column of the periodic table so it has one valence electron.
lisabon 2012 [21]
Na is cation so it loses electron to be positive and become stable losing one valence shells one electron so it's oxidation number is +1 ie A is correct
7 0
2 years ago
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Kitty [74]

Answer:

Explanation:

General reaction of acid in water is as follows:

HCl + H2O = H3O+  + Cl-

Thus Acids increase the concentration of hydronium ions in solution by donating hydrogen ions to water molecules is true  

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2 years ago
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A 0.100 m solution of which one of the following solutes will have the highest vapor pressure? A 0.100 m solution of which one o
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Explanation:

Vapor pressure is defined as the pressure exerted by vapors or gas on the surface of a liquid.

Vapor pressure is inversely proportional to the number of solute particles. Hence, more will be the solute particles lower will be the vapor pressure and vice-versa.

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5 0
2 years ago
A 0.500-mole sample of a gas has a volume of 11.2 liters at 273 k. what is the pressure of the gas? (hint: use ideal gas law equ
Ray Of Light [21]
Pv =nRT

T= 273
n = 0.500
v= 11.2 
R= 0.08206

p= 0.5×0.08206×273 ÷ (11.2) =10.00
5 0
2 years ago
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