Answer:
5.076 * 10 ⁻¹² M
Explanation:
molarity of a solution is given as -
Molarity (M) = ( w / m ) / V ( in L)
where ,
m = molecular mass ,
w = given mass ,
V = volume of solution ,
From the question ,
w = given mass of epinephrine = 0.00000093 g
V = 1 L
Since , the molecular mass of epinephrine = m = 183,204 g/mol
M = ?
In order to determine the molarity of epinephrine , the above formula is used , by putting the respected values ,
Molarity (M) = ( w / m ) / V ( in L)
M = ( 0.00000093 g / 183,204 g/mol ) / 1 L
M = 5.076 * 10 ⁻¹² M
Answer: The correct answer is Option c.
Explanation:
Vaporization is defined as the physical process in which liquid particles get converted to gaseous particles.
The value of standard Gibbs free energy is 0 for equilibrium reactions.
To calculate for the reaction, we use the equation:
where,
= standard entropy change of vaporization
= standard enthalpy change of vaporization = 30.7 kJ/mol = 30700 J/mol (Conversion factor: 1 kJ = 1000 J)
T = temperature of the reaction = 353.3 K
Putting values in above equation, we get:
Hence, the correct answer is Option c.
The change in entropy (ΔS°vap) of benzene at its normal boiling point can be calculated using the enthalpy of vaporization (ΔH°vap) and the temperature (T). The ΔS°vap for benzene at 353.3 K is 0.087 J/(mol·K).
The enthalpy of vaporization (ΔH°vap) of a substance is related to the change in entropy (ΔS°vap) by the equation ΔS°vap = ΔH°vap / T, where T is the temperature in Kelvin. We are given that the enthalpy of vaporization of benzene at its normal boiling point (T = 353.3 K) is 30.7 kJ/mol. Plugging these values into the equation, we can calculate ΔS°vap to be 30.7 kJ/mol / 353.3 K = 0.087 J/(mol·K).
#SPJ3
Answer:
Three atoms are attached to the central atom in NF3.
Explanation:
The central atom is always regarded as the atom having the least electronegativity in a molecule or ion. We can decide on what atom should be the central atom by comparing the relative electro negativities of the atoms in the molecule or ion.
If we consider NF3, we can easily see that nitrogen is less electronegative than fluorine, hence nitrogen is the central atom in the molecule. We can also observe from the molecular model that three atoms of fluorine were attached to the central atom. Hence there are three atoms attached to the central atom in the molecule NF3.
Answer:no
Explanation:
Answer:
Scandium is a transition metal
Explanation:
19.2 g of vinegar solution
Explanation:
Here we have the chemical reaction between acetic acid (CH₃COOH) and calcium carbonate (CaCO₃):
2 CH₃COOH + CaCO₃ → (CH₃COO)₂Ca + CO₂ + H₂O
number of moles = mass / molecular weight
number of moles of CaCO₃ = 0.8 / 100 = 0.008 moles
Knowing the chemical reaction, we devise the following reasoning:
if 2 moles of CH₃COOH react with 1 moles of CaCO₃
then X moles of CH₃COOH react with 0.008 moles of CaCO₃
X = (2 × 0.008) / 1 = 0.016 moles of CH₃COOH
mass = number of moles × molecular weight
mass of acetic acid (CH₃COOH) = 0.016 × 60 = 0.96 g
Now to find the volume of vinegar acid (solution of acetic acid) with a concentration of 5% (weight/volume) we use the following reasoning:
if there are 5 g of acetic acid in 100 mL of vinegar solution
then there are 0.96 g of acetic acid in Y mL of vinegar solution
Y = (0.96 × 100) / 5 = 19.2 g of vinegar solution
Learn more about:
weight/volume concentration
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2.phenolphthalein
3.bromcresol green
aThe ice makes the glass colder so the juice becomes colder.
bThe ice cools the glass of juice because the slow moving particles in the ice cause the particles of the juice to slow down.
cIce is colder than the juice. The cold travel from cold to warm until both items are the same temperature.
dThe juice is warmer than the ice. Heat travels in one direction until both items are the same temperature.
Answer:
C.
Explanation:
The other ones just don't make sense as answers to the question
Answer:
B
Explanation:
ice molecules move slowly and cluster tightly together, they produce a low amount of heat