What is the mass of 4.2 moles of sodium carbonate?

Answers

Answer 1

Answer: 4.2 mol Na2CO3 x 83g = 348.6g Na2CO3
1 1 mol

Related Questions

Which trends are observed when the elements in Period 3 on the Periodic Table are considered in order of increasing atomic number?(1) The atomic radius decreases, and the first ionization energy generally increases. (2) The atomic radius decreases, and the first ionization energy generally decreases. (3) The atomic radius increases, and the first ionization energy generally increases. (4) The atomic radius increases, and the first ionization energy generally decreases.
What orbits the nucleus of an atom?
Substances with a higher temperaturea. have less thermal energy. b. have more molecular disorder. c. become more orderly if heated more. d. will move thermal energy to a hotter substance.
The constant-pressure specific heat of air at 25°C is 1.005 kJ/kg °C. Express this value in kJ/kg-K. J/g °C, kcal/kg-°C, and Btu/lbm-°F.
Every action produces an equal and opposite -- ---------- when one object exterts a force on another object,the second object pushes back with the same amount of--------- someone knows the answer

What does the entropy of a reaction describe?

Answers

Answer:

The amount of randomness in a system.

Explanation:

took test

Answer:

entrophy is a measure of the degree of randomness or disorder of a system

What word is not associated with Exothermic? A)absorbs energy B )burning firewood C )freezing water D) releases energy

Answers

Answer:

Explanation:

Answer:

Explanation:

Not a because the term exo means outward, so exothermic means releasing energy so D.

Not B or C because they have nothing to do with exothermic (exo- outward thermic- energy)

What is the energy change that will occur when 25.5 grams of oxygen gas (O2) react with excess methane (CH4) according to the reaction below? CH4 + 2 O2yields CO2 + 2 H2O delta H = -889 kJ/mol

Select one:
a. 354 kJ of energy will be given off by the reaction
b. 354 kJ of energy will be absorbed by the reaction
c. 708 kJ of energy will be given off by the reaction
d. 708 kJ of energy will be absorbed by the reaction

Answers

amount of CH4 is excess, so no need to worry about it
but the limiting factor is the Oxygen

according to stranded equation,

CH4 + 2 O2 --> CO2 + 2 H2O ΔH = -889 kJ/mol

just by taking proportions

(-889 kJ/mol) / 2 x 0.8 mol = - 355.6 kJ

so i think the answer is (a)

What information is necessary to determine the atomic mass of the element chlorine?(1) the atomic mass of each artificially produced isotope of chlorine, only
(2) the relative abundance of each naturally occurring isotope of chlorine, only
(3) the atomic mass and the relative abundance of each naturally occurring isotope of chlorine
(4) the atomic mass and the relative abundance of each naturally occurring and artificially produced isotope of chlorine

Answers

Answer is: (3) the atomic mass and the relative abundance of each naturally occurring isotope of chlorine.

m(³⁵Cl) = 34.97 amu; the average atomic mass of chlorine-35.

m(³⁷Cl) = 36.97 amu; the average atomic massof chlorine-37.

ω(³⁵Cl) = 75.76% ÷ 100% = 0.7576; fractional abudance of chlorine-35.

ω(³⁷Cl) = 24.24% ÷ 100% = 0.2424; fractional abudance of chlorine-37.

m(Cl) = m(³⁵Cl) · ω(³⁵Cl) + m(³⁷Cl) · ω(³⁷Cl).

m(Cl) = 34.97 amu · 0.7576 + 36.97 amu · 0.2424.

m(Cl) = 35.4548 amu; average atomic mass of chlorine.

Final answer:

The atomic mass of chlorine is determined by both the atomic mass and the relative abundance of each naturally occurring isotope of chlorine. It's based on an average of the masses of the isotopes according to their relative abundance.

Explanation:

To determine the atomic mass of the element chlorine, option (3), both the atomic mass and the relative abundance of each naturally occurring isotope of chlorine is required. The atomic mass of chlorine is not just the mass of one particular atom, or isotope; instead, it's an average of the masses for all the isotopes according to their relative abundance. For instance, Chlorine has two isotopes Chlorine-35 and Chlorine-37. If the relative abundance of Chlorine-35 is 75% and that of Chlorine-37 is 25%, the atomic mass is calculated by the formula [(0.75 x 35) + (0.25 x 37)].

Learn more about Atomic Mass here:

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A force of 1 700 N is applied to a 1 300 kg car. what is the magnitude of acceleration of the car?

Answers

Hello!

Answer:

$\Large \boxed{\sf 1.30 m/s^2}$

Explanation:

→ The force applied to an object is equal to:

$\sf a = F / m$

Where:

- a is the acceleration

- F is the force

- m is the mass

→ So, the acceleration of the car is equal to:

$\sf a = F / m \n\n= 1700 N / 1300 kg\n\n \approx 1.30 m/s^2$

Conclusion:

The acceleration of the car is 1.30m/s².

Explanation:

acceleration is directly proportional to the force and inversely proportional to the mass of the object

a=f/m

=1700/1300

Which laboratory test result can be used to determine if KCl(s) is an electrolyte?(1) pH of KCl(aq)
(2) pH of KCl(s)
(3) electrical conductivity of KCl(aq)
(4) electrical conductivity of KCl(s)

Answers

Answer: (3) electrical conductivity of KCl (aq)

Explanation: pH is the measure of acidity or alkalinity.

Conductance is the ability of a substance to be able to conduct electric current through it. Electrolyte is a solution which enables electric current to pass through them due to the presence of ions.

Ionic compounds do not conduct electricity in solid state as the ions are strongly held by strong coloumbic forces but in aqueous solutions they dissociate into ions and thus act as good conductors.

$KCl(aq)\rightarrow K^+(aq)+Cl^-(aq)$

The answer is (3) electrical conductivity of KCl(aq). The definition of electrolyte is that the substance that will ionize when dissolving in suitable ionizing solvent like water.

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