Question 4

A reaction produces 0.755 mol of H2O. How many molecules of water are produced?

Fynjy0 [20]

Answer:

4.55 * 10^23 molecules

Explanation:

This is a conversion problem. We know that one mole has 6.022 *10^23 particles or molecules so we can use this as a conversion factor.

0.755 mol ( 6.022*10^23 molecules/ 1 mol)

=4.55*10^23 molecules

7 0

3 years ago

Ammonium carbamate (NH2COONH4) is a salt of carbamic acid that is found in the blood and urine of mammals. At 240°C, Kc = 0.006

SashulF [63]

Missing information:

Equilibrium reaction: NH2COONH4(s)⇌2NH3(g)+CO2(g)

Answer:

14.43 atm

Explanation:

The equilibrium occurs when in a reversible reaction, the velocity of the formation of the products is equal to the velocity of the formation of the reactants. When this occurs, the concentration and partial pressures remain constant. To characterize the equilibrium there's the equilibrium constant, which can be based on the concentration (Kc) or based on the gases partial pressure (Kp).

The conversion between them is:

Kp = Kc*(RT)⁻ⁿ

Where n is the variation of the coefficients of the gas substances (reactants - products) so, n = 0 - (2+1) = -3

Kp = Kc*(RT)³

R is the gas constant (0.082 atm.L/mol.K), and T is the temperature ( 240°C = 513 K), so:

Kp = 0.006*(0.082*513)³

Kp = 446.6

The value of Kp is also the ratio between the multiplication of the partial pressures of the products divided by the partial pressure of the reactants, each one elevated by the coefficient of the substance, and only for gas substances, so:

Kp = (pNH3)²*(pCO2)

Doing an equilibrium chart

NH3 CO2

0 0 Intial

+2x x Reacts (stoichiometry is 2:1)

2x x Equilibrium

446.6 = (2x)²*x

4x³ = 446.6

x³ = 111.65

x = ∛111.65

x = 4.81 atm

pNH3 = 2*4.81 = 9.62 atm

pCO2 = 4.81 atm

By Dalton's law, the total pressure of a gas mixture is the sum of the partial pressure of the substances:

P = 9.62 + 4.81 = 14.43 atm

8 0

3 years ago

A blu-ray laser has a wavelength of 405nm. In what region of the electromagnetic spectrum is this radiation? What is its frequen

love history [14]

Answer:

It lies in in the visible region.

Frequency: is 7.407 × 10^-14 Hz

${ \bf{V = f \lambda}} \\ { \tt{3.0 \times {10}^{8} = f \times (405 \times {10}^{ - 9}) }} \\ { \tt{f = 7.407 \times {10}^{14} \: hertz}}$

Explanation:

V is speed of light.

f is frequency

lambda is the wavelength

8 0

2 years ago

Write a balanced nuclear equation for the β emission of the following isotopes

andrezito [222]

The balanced nuclear equation for the β emission of the following isotopes is seen below:

92 92 0

Sr ⇒ Y + e

38 39 -1

<h3>What is Beta emission?</h3>

This is also known as beta decay in which a beta ray is emitted from an atomic nucleus.

The element formed during the beta emission of strontium is referred to as Yttrium.

Read more about Beta emission here brainly.com/question/16334873

#SPJ1

6 0

1 year ago

Uestion 3 (1 point)

elena-s [515]

Answer:

density=mass/volume.

density=14/18

=0.777777777 ~ 0.8g/ml.

It will float because the it lesser than the density of water.

6 0

3 years ago

Read 2 more answers