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arlik [135]
3 years ago
8

To the nearest whole number how many moles are in 130 g sample of calcium metal?

Chemistry
1 answer:
lesantik [10]3 years ago
6 0
To convert grams to moles, we need the molar mass of the element or compound. remember you can determine the molar mass of a molecule by adding the atomic mass of each atom from the periodic table.

molar mass of Na= 23.0 g/ mol

130 g (1 mol Na/ 23.0 grams)= 5.65 moles or 6 moles.
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Prform the following operation and express the answer in scientific notation 6.0 x 10^3-2.310^3
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The value 6.0 x 10^3- 2.3 × 10^3 in scientific notation is 3.7 × 10^3.

<h3> What is scientific notation?</h3>

Scientific notation is a way to write very large or very small numbers so that they are easier to read and work with.

You express a number as the product of a number greater than or equal to 1 but less than 10 and an integral power of 10 .

<h3>Why it is used? </h3>

There are two reasons to use scientific notation.

  • The first is to reveal honest uncertainty in experimental measurements.
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Given,

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= (6.0 - 2.3) × 10^3

= 3.7 × 10^3

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