Which best explains why the total mass of the product(s) would be less than thetotal weight of the reactant(s) after a chemical reaction?

Answers

Answer 1

Answer: The law of conservation of mass applies to all chemical reaction, so this means that there was equal mass before and after the reaction. However, if the mass has decreased, then it means there has been a loss of substance. The most common cause of this is the liberation of gases from a chemical reaction mixture, the mass of which is not measured by the scale.

Answer 2

Answer:

Gases were released to the atmosphere.

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HELP PLEASE I need help with these 2 chem questions asap i would gladly appreciate it :)

Answers

10) You need to find the atomic mass of every element, which you can get from any periodic table.

a) 6.02x10^23 atoms of Mg

Atomic mass of Mg = 24.3 g/mol

# of mols = 6.02 x 10^23 atoms / 6.02 x 10^23 atoms/mol = 1 mol

mass = 1 mol x 24.3 g/mol = 24.3 g

b) 3.01x10^23 formula units of Ca Cl2

Atomic masses

Ca: 40 g/mol
Cl: 35.5 g/mol

Formula mass: 40g/mol + 2x 35.5g/mol = 111 g/mol

# of mols = 3.01 x 10^23 / 6.02 x 10^23 = 0.5 mol

mass = 0.5 mol x 111 g/mol = 55.5 g

c) 12.4 x 10^15 molecules of CH2O

formula mass = 12 g/ mol + 2 g/mol + 16 g/mol = 30 g/mol
# of mols

mass = [12.4 x 10^15 / 6.02 x 10^23]mol x 30 g/mol = 2.1 x 10 ^(-8) g

3)

a) The polar solute is dissolved in water which is a polar solvent, while the non polar solute is not dissolved in water. This is a rule in chemistry: polar solvents dissovle polar soultes and non polar solvents dissolve non polar soluted.

The extremes of the polar molecules are easily solvated by the water molecules.

b) KI is an ionic compound, which implies that it will ioinize (separare in iones) in water, being in this way be dissolved, while the CO2, which is no polar, will not be easily dissolved in water under normal conditions

What is the number of moles in 15.0 g AsH3?

Answers

We are given with the mass of Arsine ( $AsH_(3)$

The mass of arsine is 15g

there is a relation between moles, mass and molar mass of any compound which is

$moles=(mass)/(molarmass)$

The molar mass of Arsine = atomic mass of As + 3X atomic mass of H

the molar mass of Arsine = 74.92 + 3X 1 = 77.92 g/mol

Let us calculate the moles as

$moles=(15)/(77.92)=0.192mol$

A tank has 30 gallons of gasoline how many liters of gasoline are there in the tank

Answers

Answer:

$113.55 l$

Explanation:

1 gallon equals 3,785 liters.

How many liters are in 30 gallons?

We apply a simple rule of three to solve it

$1 gallon \longrightarrow 3.785 l\n 30 gallons \longrightarrow x \n x=((30 gallons)(3.785l))/(1 gallon)= 113.55 l.$

Answer: I think it is: 113.5624 Liters of gas

Explanation:

HELP ASAP 20 PTS!!!Fireworkium (Fw): This element has 15 protons and 15 electrons in its neutral atom.

Toothium (T): This is a nonmetal with an average atomic mass number close to 19.

Floatium (Fl): This is a gas that the aliens often use to fill balloons and blimps. It contains two protons in its nucleus.

Breathium (Bt): This element is a nonmetal and has one less proton than an atom of Toothium and has an atomic mass close to 16 amu.

Lightium (Lg): This is a gas that does not react with other elements. It glows when it is heated in a lamp or vacuum tube. It contains one more proton in its nucleus than Toothium.

Rottoneggium (Re): This is a nonmetal with one less electron than Mustarium. It has a total of 16 electrons in its electron cloud.

I honestly don't understand

Answers

Basically they are asking you to find the element that is most closely associated with these clues.

1. Fireworkium: 15 protons and 15 electrons? No problem. We can see that the atomic number is 15, in which in real life, the element is Phosphorous. (Phosphorous is a common element in fireworks for an explosive personality and colors)

2. Toothium: A nonmetal with average mass number close to 19? We check the periodic table once more and find that Fluorine is our answer. (Notice that fluorine is in toothpaste, which is why they decided the name Toothier)

3. Breathium: Now honestly, I didn't even have to check the periodic table but just realize that we breath Oxygen. But if you want the straight answer, Oxygen is a nonmetal which has an atomic mass close to 16, and surprise, it has one less proton than Fluorine.

4.Lightium: Immediately we see that since this gas does not react with other elements, it is a noble gas. If it glows in a lamp or vacuum tube, we can also see it is of a light origin. If it has one more proton than Toothium (Fluorine) than we can immediately see that in the periodic table, our answer is Neon.

5. Rottoneggium: We can immediately guess sulfur. The straight way shows that it has 16 electrons, and the non-ion atom should also have 16 protons. Therefore, our answer is Sulfur.

6. I just realized I forgot Floatium: If it has 2 protons, we look in the periodic table and see that our answer is Helium.

A 475mL sample of gas was collected at a temperature of -21.5 and a pressure of 756mmHg. Calculate the volume of a gas(in liters) if the conditions were altered to STP

Answers

The volume of gas under STP is 0.512 liters.

Explanation:

At STP (Standaed Temperature and Pressure)

T = 0°C

P = 1 atm = 760 mmHg

Given

P1 = 756 mmHg

T1 = -21.5°C = -21.5 + 273 = 251.5 K

V1 = 475 mL = 0.475 L

P2 = 760 mmHg

T1 = 0°C = 0 + 273 = 273 K

We know that

$(P1 * V1)/(T1) = (P2 * V2 )/(T2)\n\n(756 * 0.475)/(251.5) = (760 * V2)/(273)\n$

$V2 = (273 * 756 * 0.475)/(251.5 * 760) \nV2 = (98034.3)/(191140)$

V2 = 0.512 L

Which property is a measure of the average kinetic energy of the particles in a sample or matter?(1) mass (2) density (3) pressure (4) temperature

Answers

The temperature of a sample of matter is the macroscopic manifestation
of the average kinetic energy of its constituent particles.

That's choice-(4) .

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