What is the mass of .1 mole of magnesium atoms?

1 Answer
Jun 26, 2017

Answer:

#2.43# #"g"#

Explanation:

We're asked to find the mass of #0.1# #"mol Mg"#.

To solve this, along with any mass-to-mole conversion, we need to know the molar mass of the substance.

On most periodic tables, for each element there is a mass number under the element's symbol. This is the mass of one mole of that element, called its molar mass. For magnesium, this is #color(red)(24.30# #color(red)("g/mol"#.

Using dimensional analysis, we can convert the given mole number (#0.1# #"mol"#) to grams:

#0.1cancel("mol Mg")((color(red)(24.30)color(white)(l)color(red)("g Mg"))/(1cancel("mol Mg"))) = color(blue)(2.43# #color(blue)("g Mg"#

Thus, #0.1# mole of magnesium atoms has a mass of #color(blue)(2.43# #sfcolor(blue)("grams"#..