Subject Test Chemistry

Question 2 of 9

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Each of the following questions consists of two statements, I in the left-hand column and II in the right-hand column. For each question, determine whether statement I is true or false and whether statement II is true or false. Select the appropriate answer combination from the choices below. Choices with a filled CE oval denote that statement II is a correct explanation of the true statement I.

At the same temperature and pressure,

1

L of hydrogen gas and

1

L of neon gas have the same mass

BECAUSE

equal volumes of ideal gases at the same temperature and pressure contain the same number of moles.

Select an Answer

Correct Answer:

No

Correct Answer:

No

Correct Answer:

No

Correct Answer:

Yes

Correct Answer:

No

View Correct Answer

The correct answer is F, T.

According to the ideal gas law $(P V = n R T)$ , if $P$ , $V$ , and $T$ are the same for two different gases, then $n$ (the number of moles) must be the same. Statement $II$ is therefore true. One mole of $H_{2} (g)$ has a mass of $2$ grams and one mole of $Ne (g)$ has a mass of $20$ grams. Equal numbers of moles of these gases do not have the same mass. Statement $I$ is therefore false.