What is the mass of a sample of NH3 containing 7.20 x 10^24 molecules of NH3?

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Komok [63]

1. In 1687 following 18 months of intense and effectively nonstop work
2.Hooke
3.Halley
4. Halley urged newton to write Principia mathematica and when the Royal society declined to pay the cost of publishing Halley paid for it out of his own pocket
5.Through using a telescope Galileo Galilei was able to prove the theories of sciences Isaac newton
6. He believe that the speed of an object motion is proportional to the force being applied and inversely proportional to the density of the medium he reason that the object moving in a void would move in definitely fast and thus any and all objects
7. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force
8.gottfried wilhelm von leibniz

6 0

3 years ago

4). One mole of monoclinic sulfur at 25C was placed in a constant-pressure calorimeter whose heat capacity (C) was 1620 J/K. T

andre [41]

Answer: The enthalpy change of the reaction is -243 J/mol

Explanation:

The heat released by the reaction is absorbed by the calorimeter and the solution.

The chemical equation used to calculate the heat released follows:

$q=c\times \Delta T$

where,

c = heat capacity of calorimeter = 1620 J/K

$\Delta T$ = change in temperature = $0.150^oC=0.150K$ (Change remains same)

Putting values in above equation, we get:

$q=1620J/K\times 0.15K=243J$

Sign convention of heat:

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

For the given chemical reaction:

$S\text{ (monoclinic)}\rightarrow S\text{ (orthorhombic)}$

We are given:

Moles of monoclinic sulfur = 1 mole

To calculate the enthalpy change of the reaction, we use the equation:

$\Delta H_{rxn}=\frac{q}{n}$

where,

q = amount of heat released = -243 J

n = number of moles = 1 mole

$\Delta H_{rxn}$ = enthalpy change of the reaction

Putting values in above equation, we get:

$\Delta H_{rxn}=\frac{-243J}{1mol}=-243J/mol$

Hence, the enthalpy change of the reaction is -243 J/mol

8 0

3 years ago

Which of the following is an oxide which is strongly acidic?

borishaifa [10]

Answer:

answer of your question is 4th

Explanation:

P205

3 0

3 years ago

Draw and label the parts of a helium atom. Include the mass and charge of each subatomic particle.

mihalych1998 [28]

Explanation:

Helium is the second element on the periodic table.

Information about helium:

it belongs to group O on the periodic table
it is has an atomic number of 2
Helium exists naturally as gas and it is nonreactive.

To write an atom we use this format:

ₙᵇGˣ

G is the symbol of the atom

n is the atomic number

b is the mass number

x is the charge on the atom

Using the periodic table as guide

Symbol of helium is He

Atomic number of helium is 2

mass number of helium is 4

charge on helium atom is 0

⁴₂He

Every atom contains protons, neutrons and electrons;

Electrons are negatively charged. For a neutral atom, the number of electrons is the same as that of protons.

Protons are positively charge particles in an atom. The atomic number is the number of protons in an atom.

neutrons do not have charges.

Helium has:

Number of protons = 2

Number of electrons = 2

Number of neutrons = 2

Mass of each subatomic particle:

1 electron = 9.11 x 10⁻³¹kg

2 electrons = 1.82 x 10⁻³⁰kg

Protons and neutrons have the same mass:

1 proton = 1.67 x 10⁻²⁷kg

2 protons = 3.34 x 10⁻²⁷kg

2 neutrons = 3.34 x 10⁻²⁷kg

Learn more:

helium brainly.com/question/2439349

#learnwithBrainly

4 0

3 years ago

A group of students created a model showing a type of matter which of the following discribes what is shows by the model?

Lady_Fox [76]

Answer:

liquid

Explanation:

6 0

3 years ago