Question

What is the mass of 7.2 moles of titanium to the nearest tenth?

Answer 1

`"344.6 g"`

Explanation:

The first thing to do here is to figure out the mass of one mole of titanium, `"Ti"`.

To do that, grab a periodic table and look for titanium. You'll find this metal located in period 4, group 4.

Notice that titanium has a molar mass equal to `"47.867 g mol"^(-1)`, which means that one mole of titanium has a mass of `"47.867 g"`.

Now that you know the mass of one mole of titanium, you can calculate the mass of `7.2` moles by using the metal's molar mass as a conversion factor

`7.2 color(red)(cancel(color(black)("moles Ti"))) * "47.867 g"/(1color(red)(cancel(color(black)("mole Ti")))) = "344.6424 g"`

The last thing to do here is round this off to the nearest tenth, which means leaving the answer rounded to one decimal place

`color(green)(|bar(ul(color(white)(a/a)color(black)("mass of 7.2 moles Ti " = " 344.6 g")color(white)(a/a)|)))`