What is the mass in grams of #"3.5 moles Ca"#?

Answer 1

The mass of 3.5 moles of Ca is 140 g to two significant figures.

First determine the molar mass of calcium. Molar mass is the mass in grams in one mole of a substance. For elements, we just need the atomic weight on the periodic table written as g/mol.

The molar mass of calcium is 40.078 g/mol.

Now multiply the given number of moles of #"Ca"# by its molar mass.

#3.5 cancel"mol" "Ca"xx40.078"g"/cancel"mol"="140 g Ca"# to two significant figures

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Answer 2

Natalie Anton

Since calcium (Ca) has a molar mass of about 40.08 g/mol, 3.5 moles of calcium have a mass of (3.5 , \text{moles} \times 40.08 , \text{g/mol} = 140.28 , \text{g}).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.