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3 years ago

Calculate how many moles of NH3 form when each quantity of reactant completely reacts according to the equation:

1 answer:

7 0

The balanced chemical reaction is:

3N2H4(l)→4NH3(g)+N2(g)

The amounts given for the N2H4 reactant will be the starting point for our calculations.

2.6mol N2H4 ( 4 mol NH3 / 3 mol N2H4 ) = 3.47 mol NH3

4.05mol N2H4 ( 4 mol NH3 / 3 mol N2H4 ) = 5.4 mol NH3

63.8g N2H4 ( 4 mol NH3 / 3 mol N2H4 ) = 85.07 mol NH3

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Which of the following interactions can contribute to the intrinsic binding energy during enzymatic catalysis? choose all that a

Lady_Fox [76]

1. electrostatic interactions
3. van de waals interactions 
4. hydrogen bonding

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2 years ago

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1. A light bulb is filled with 3.54 g of argon at 25 C and 725 mmHg. What is

Ugo [173]

Answer: The volume of given gas is 2.27 L.

Explanation:

Given: Mass = 3.54 g

Temperature = $25^{o}C$ = (25 + 273) K = 298 K

Pressure = 725 mm Hg (1 mm Hg = 0.00131579) = 0.95 atm

As moles is the mass of substance divided by its molar mass.

So, moles of argon (molar mass = 40 g/mol) is as follows.

$Moles = \frac{mass}{molar mass}\\= \frac{3.54 g}{40 g/mol}\\= 0.0885 mol$

Formula used to calculate the volume of given gas is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

$PV = nRT\\0.95 atm \times V = 0.0885 mol \times 0.0821 L atm/mol K \times 298 K\\V = 2.27 L$

Thus, we can conclude that the volume of given gas is 2.27 L.

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2 years ago

What structural feature of lecithin allows it to behave like an emulsifying agent?

stepladder [879]

Lecithin is an emulsifier agent that's composed of 5 smaller molecules: phosphoric acid, choline, glycerol( is the backbone), and two fatty acids.

The fatty acids, which are hydrophobic (afraid of water), makes this substance more similiar to fats and represent the non-polar part of the lecithin.
The phosphate group is the polar portion of the molecule and it's the negatively charged. The choline is positively charged, which readily dissolve in water.

Lecithin is a good emulsifier because of these structural features. the hydrophobic contacts with the oil, while the hydrophilic end contacts with the water.

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2 years ago

What mass of metallic silver can form from 1.147 g of copper metal according to equation b?

Arisa [49]

Answer:

$\large\boxed{\large\boxed{3.894g}}$

Explanation:

From similar question, equation (b) is

Molecular Equation:

Cu(s) + 2AgNO₃(aq) → Cu(NO₃)₂(aq) + 2Ag(s)

Net Ionic Equation:

Cu(s) + 2Ag⁺(aq) → Cu²⁺(aq) + 2Ag(s)

1. Mole ratio:

$\dfrac{2molAg(s)}{1molCu(s)}$

2. Convert 1.147 g of Cu(s) to moles:

Atomic mass of Cu: 63.546g/mol

Number of moles = mass in grams / atomic mass

Number of moles = 1.147 g / 63.546 g/mol = 0.01805 mol Cu(s)

3. Calculate the moles of Ag(s):

$0.01805molCu(s)\times \dfrac{2molAg(s)}{1molCu(s)}=0.03610molAg(s)$

4. Convert 0.03610 mol Ag(s) to grams:

Atomic mass of Ag(s) = 107.868g/mol

Mass = 0.03610mol × 107.868g/mol = 3.894g

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2 years ago

A pharmacist wishes to mix a solution that is 5% Minoxidil. She has on hand 80 ml of a 4% solution and wishes to add some 7% sol

Alona [7]

The 80 ml solution has (.04)(80) ml of the medicine, or 3.3 ml of medicine.The pharmacist adds V ml of 7% solution, or .07V ml of medicine. The total amoune of medicine is (.07V + 3.2) mg. The total volume of solution is (V + 80) ml, so (.07V + 3.2) / (V + 80) = .05. Solve for V.

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2 years ago

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