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3 years ago

Give the number of significant figures in this number: 40.00

Chemistry

2 answers:

erica [24]3 years ago

5 0

Answer:

Explanation:

because the follow digits are part of the answer even though they are following a decimal

Tatiana [17]3 years ago

4 0

A significant figure is every symbol that made the number itself.

In this case, the number 40.00 has four figures but only two of them are significant 40, this is because you haven't got any more decimals than the first zero.

If you have a case with zeros in front, you take to the first non zero digits.

For example, 0.071004 you wold express as 0.071 and those 7, and 1 are the significant ones.

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3 years ago

1. How many moles of magnesium is 3.01 x 10^23 atoms of magnesium?

AlexFokin [52]

Answer:

<h2>0.5 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{3.01 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.01}{6.02} = 0.5 \\$

We have the final answer as

<h3>0.5 moles</h3>

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