Calculate the number of atoms in 23 g of sodium (Na).

Answers

Answer 1

Answer: First find moles of sodium:
(23.0g Na)/(22.99g/mol Na) = 1mol Na

Second multply moles by Avogadro's number: (1mol Na)(6.02x10^23 atoms) = 6.02x10^23 atoms Na

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The half-life of fluorine-20 is 11.4 seconds. After _______ seconds, 1/4 of the original amount of fluorine-20 will remain

Answers

Answer:

The answer is 22.8

Explanation:

Just took the quiz on APEX :)

The molar heat of fusion for water is 6.01 kJ/mol. How much energy is released when 36.8 g of water freezes at its freezing point?

Answers

The answer there is 12.3 kJ. First you have to calculate the amount of heat released (n) based on the given. Just multiply 36.8 grams of water to a mole of water per 18.015 grams, which will give you 2.04 moles of H2O. Using the formula heat released (q) = number for moles of the substance (n) multiplied to the molar enthalpy of fusion of the substance (H), you will have the (2.04 mole)(-6.01 kJ/mole), giving you an answer of -12.3kJ.

Answer:

12.3 kJ

Explanation:

12. Which classification describes the Milky Way? regular spiral barred spiral elliptical irregular

Answers

the milky way is a spiral galaxy with 2 central arms

a car traveling at 20 m/s starts to decelerate steadily it comes to a complete stop in 10s .what is its acceleration

Answers

A car traveling at 20 m/s starts to decelerate steadily it comes to a complete stop in 10s. The equation for the acceleration is velocity divided by time. So divide 20 m/s by 10 s and you will get an acceleration of 2 m/s2.

In terms of atomic structure what is an Atoms atomic number

Answers

the atomic number is the average number of protons and neutrons in an atom this is found by looking at the number below the main number on the periodic table.

Answer: An atom a fundamental piece of matter. ... An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.

Explanation:

1. For each of the following numbers, by how many places must the decimal point bemoved to express the number in scientific notation?
II. For each number, will the exponent be positive, negative, or zero?
0.0000089911

Answers

The number that you have shown the exponent would be negative and I believe it would be 6 places so 8.9911 x 10^-6

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How many hydrogen atoms are in the following molecule of ammonium sulfide? (NH4)2Sa. 2 b. 4 c. 8 d. 16

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Electrons are capable of emitting energy in the form of light at very narrow ranges of wavelengths. These wavelengths can be measured to find the electron's a. mass. b. density. c. energy level. d. specific heat.