Q: Given that $$1 \text{ amu} = 1.66054 \times 10$$^{-24}$$ \text{ g}$$, what is the mass in grams of $$5.00$$ amu?

$$8.30 \times 10$$^{-24}$$ \text{ g}$$

Q: Which of the following is the correct calculation for the number of atoms in $$196.23 g of $$osmium, given that the atomic mass of osmium is $$190.2$$ amu?

$$\frac{196.23}{190.2} \times 6.022 \times 10$$^{23}$$

Question 1

Which of the following statements best describes the charge and relative mass of a neutron?

Accepted Answer

A neutron has a charge of $$0$$ and a relative mass of $$1$$

Question 2

Which subatomic particle is responsible for the identity of an element and why?

Accepted Answer

The proton, because it determines the atomic number

Question 3

Given that $$1 	ext{ amu} = 1.66054 	imes 10$$^{-24}$$ 	ext{ g}$$, what is the mass in grams of $$5.00$$ amu?

Accepted Answer

$$8.30 	imes 10$$^{-24}$$ 	ext{ g}$$

Question 4

If an atom contains $$11$$ protons, $$12$$ neutrons, and $$11$$ electrons, what is its net charge?

Accepted Answer

$$0$$

Question 5

Which of the following best explains why the mass of an atom is concentrated in its nucleus?

Accepted Answer

Because protons and neutrons are located in the nucleus and have much greater mass than electrons

Question 6

A sodium atom has a mass of $$22.99$$ amu. How many sodium atoms are present in $$0.200 g of $$sodium?

Accepted Answer

$$2.09 	imes 10$$^{21}$$

Question 7

Which of the following is the correct calculation for the number of atoms in $$196.23 g of $$osmium, given that the atomic mass of osmium is $$190.2$$ amu?

Accepted Answer

$$\frac{196.23}{190.2} 	imes 6.022 	imes 10$$^{23}$$

Question 8

Which subatomic particle has a mass of approximately $$1.673 	imes 10$$^{-24}$$ g?

Accepted Answer

Proton

Question 9

If you have $$1.2045 	imes 10$$^{-19}$$ kg of a substance, and each atom has a mass of 1.67$$ 	imes $$10^{-27} kg$$, how many atoms are present?

Accepted Answer

$$2.09 	imes 10$$^{8}$$

Question 10

Which of the following best describes the charge of an electron?

Accepted Answer

$$-1$$

Question 11

Why is the atomic mass unit (amu) defined based on the mass of a carbon-12 atom?

Accepted Answer

Because carbon-12 provides a convenient and reproducible standard for atomic masses

Question 12

Which of the following is a correct statement about the relative masses of subatomic particles?

Accepted Answer

Protons and neutrons have nearly the same mass, while electrons are much lighter

Subatomic Particles and Atomic Mass Calculations

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