Final Exam Review Flashcard - Day 3

Front

What is dimensional analysis?

Back

Dimensional analysis is a mathematical technique used to convert one unit of measurement to another using conversion factors.

Front

How do you convert grams to atoms?

Back

To convert grams to atoms, use the formula: (mass in grams) / (molar mass) x (Avogadro's number).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of atoms or molecules in one mole of a substance.

Front

What is the formula to convert atoms to moles?

Back

Moles = Atoms / Avogadro's number.

Front

What is the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, typically expressed in grams per mole.

Front

How many atoms are in 2 moles of calcium (Ca)?

Back

There are 2 x 6.022 x 10^23 = 1.2044 x 10^24 atoms of calcium in 2 moles.

Front

What is the conversion factor to go from moles to atoms?

Back

The conversion factor is Avogadro's number (6.022 x 10^23 atoms/mole).

Front

What is the significance of the molar mass in conversions?

Back

Molar mass is used to convert between grams and moles, allowing for the calculation of the number of particles in a given mass.

Front

How do you determine the number of moles from a given number of atoms?

Back

Divide the number of atoms by Avogadro's number.

Front

What is the correct setup for converting 27.76 g of Li to atoms?

Back

Use the molar mass of Li (6.94 g/mol) and Avogadro's number to find the number of atoms.