CHEMISTRY HIGH SCHOOL

How much does 9.8 liters of ammonia (NH3) weigh at standard temperature and pressure (273 K and 100 kPa)?

Answers

Answer 1

Answer:

Answer: The mass of ammonia will be 7.34 g

Explanation:

To calculate the number of moles, we use the equation given by ideal gas equation:

$PV=nRT$

Or,

$PV=(m)/(M)RT$

where,

P = pressure of the gas = 100 kPa

V = Volume of gas = 9.8 L

m = Given mass of ammonia = ? g

M = Molar mass of ammonia = 17 g/mol

R = Gas constant = $8.31\text{L kPa }mol^(-1)K^(-1)$

T = temperature of the gas = 273 K

Putting values in above equation, we get:

$100kPa* 9.8L=(m)/(17g/mol)* 8.31\text{L kPa }mol^(-1)K^(-1)* 273K\n\nm=7.34g$

Hence, the mass of ammonia will be 7.34 g

Answer 2

Answer: 9.8 × 17 / 22.4 = 7. 44g

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The solution set of axequalsb is the set of all vectors of the form wequalspplusbold v subscript h, where bold v subscript h is any solution of the equation axequals0.

Answers

Answer : Incorrect

Explanation : In the given solution set of Ax = b;
is set of all vectors to form w= p + $V_(h)$
here $V_(h)$ is is any solution of the equation Ax = 0;

this stands to be incorrect, as the correct would only exists when some vector p is found to be like this Ap=b

Approximately how long has the Moon been geologically inactive?A. 1 billion years
B. 3 billion years
C. 4 billion years
D. 4.5 billion years

Answers

The moon had been geologically inactive for B. 3 billion years

The reaction of a Lewis acid with a Lewis base would most likely be accompanied by an increase in which item?covalent bonds

hydronium ions

electron pairs

hydroxide ions

Answers

The correct option is COVALENT BONDS.

A Lewis acid is defined as a substance which accept a pair of electron while a Lewis base refers to a substance that donate an unshared pair of electrons to another chemical specie with which it shared the donated pair of electrons.

Lewis acid and Lewis base react together to form salt and water. This type of reaction is called neutralization reaction. The neutralization reaction of Lewis acid and Lewis base involves electron pairs transfer, thus, there is an increase in the number of covalent bonds during this reaction.

Answer:

The correct answer is "covalent bonds".

Explanation:

A covalent coordinated or dative bond is formed when two atoms are linked together, sharing a pair of electrons. But only one of these atoms is the one that brings the pair of shared electrons. For this type of bond to occur, it is required that the donor atom has a pair of free electrons in an outer orbital and the acceptor atom has the capacity to receive that pair of electrons in its last valence layer.

On the other hand, a Lewis base is a substance that can share or donate a pair of electrons, because they have a pair of solitary electrons. A Lewis acid is that substance that accepts or takes a pair of electrons because they have their last electron layer incomplete.

It is then possible to say that an Lewis acid-base reaction is formed by the Lewis acid and base joined by a coordinated covalent bond.

So, the correct answer is "covalent bonds".

Which of the following examples is a compound containing an ionic bond?A. O2
B. H2O
C. CaO
D. CH4

Answers

Answer:

caO

Explanation:

Final answer:

Among the given options, Calcium Oxide (CaO) contains an ionic bond. This bond is formed through the transfer of two electrons from a calcium atom to an oxygen atom.

Explanation:

The question seeks to identify the compound that contains an ionic bond from the provided options. Ionic bonds are usually formed between metals and non-metals. In these cases, the metal atom donates an electron to the non-metal atom, leading to the formation of a positively charged cation and a negatively charged anion. These oppositely charged ions then attract each other, forming an ionic bond.

Let's look at the options:

A. O2 - Oxygen molecules are formed by the sharing of electrons between two oxygen atoms, which is a covalent bond, not ionic.
B. H2O - water contains two hydrogen atoms bonded to an oxygen atom. These are covalent bonds as well.
C. CH4 - Methane, comprised of carbon and hydrogen atoms, involves covalent bonding.
D. CaO - Calcium Oxide is formed by the transfer of two electrons from a calcium atom to an oxygen atom, resulting in an ionic bond. Therefore, CaO is the correct answer.

Learn more about Ionic Bond here:

brainly.com/question/18297125

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In 1 kilogram of pure water, the mass of hydrogen atoms is approximately 112 grams, or 0.112 kilograms. What is the energy equivalent of this mass in joules?

Answers

Using Einstein’s famous equation, E = mc^2

Given mass, m = 0.112 kg and knowing c = 3.0 x 10^8 m/s, energy E can be determined

E = (0.112 kg)(3.0 x 10^8 m/s)^2

= 1.008 x 10^16 J

Hope this helps

Answer:

$1.008* 10^(16)$ Joules is the energy equivalent of this .

Explanation:

Mass of hydrogen atoms in 1 kg of water = 112 g= 0.112 kg

Mass and energy related together and that expression was given by the famous scientist named Albert Einstein:

$E=mc^2$

E = Energy related to mass m

c = Speed of the light

m = 0.112 kg , c = $3* 10^8 m/s$

$E=0.112 kg* (3* 10^8)^2=1.008* 10^(16) J$

$1.008* 10^(16)$ Joules is the energy equivalent of this .

A bus traveled 280 kilometers between two cities . It left the first city at 3:00 p.m. and arrived at the second city at 7:00 p.m. What was the average speed of the bus during the trip ?

Answers

Answer:

70 kilometers per hour

Explanation:

280 kilometers ÷ 4 hours (7:00 pm - 3:00 pm = 4 hours) = 70 kilometers per hour

Hope this helps! Sorry if wrong. You are loved and you are beautiful/handsome!

-Bee

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