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Feliz [49]
3 years ago
15

To eight significant figures, avogadro's constant is 6.0221367×1023mol−1. which of the following choices demonstrates correct ro

unding?

Chemistry
2 answers:
Paha777 [63]3 years ago
6 0

All of the following choices demonstrates correct rounding

<h3>Further explanation</h3>

There are general rules used in rounding numbers

  • 1. Determine the rounded digit
  • 2. Pay attention to the digits afterward (right). If the digit shows the numbers 0, 1, 2, 3 or 4, then the digit to be rounded is fixed, and the digit on the right is 0
  • 3. If the digit on the right shows the numbers 5, 6, 7, 8 or 9, then the digit to be rounded is added to one, and the digit on the right side is made all 0

for example, In rounding the nearest hundreds number, then we see the digit in the number tens (right of the digit hundreds), if it is worth 0, 1, 2, 3 or 4, then it remains, but if it shows numbers 5, 6, 7, 8 or 9, then the digit to be rounded is added one, and the right-hand side is 0

Choice of answer we add from the problem above:

6,022 × 10²³mol⁻¹

6.0 × 10²³mol⁻¹

6,02214 × 10²³mol⁻¹

For the Avogadro number of 6.0221367 × 10²³mol⁻¹

  • 1. If we round into a 4 digit significant number, we see the digit after the number from the 4th digit of the 6.022 number (i.e. 2)

After this 4th digit we see number 1 so the rounding remains to be: 6,022

  • 2. For Avogadro numbers on rounding to 2 digits, because the number after 0 at number 6.0 is 2 then the rounding is fixed so that it is worth 6.0
  • 3. For Avogadro numbers in rounding to 6 digits, because the number after 3 at number 6.0221367 is 6 then rounding up so that it is worth 6.02214

So all of the answer choices are correct

<h3>Learn more</h3>

five numbers that are round up and round down to 600

brainly.com/question/258166

all the numbers that round to 50

brainly.com/question/136503

round 4,398,202 to the nearest 100

brainly.com/question/640968

Round number 4278649 to nearest 100

brainly.com/question/829024

Keywords: round up, round down, the rounded digit

FrozenT [24]3 years ago
5 0
6.0221367 rounded from the last digit would be 6.022137 but when using it calculations, you should just use 6.022 x 10^23.  
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One acid, HA, has a pKa of 3.16 and another, HB, has a pKa of 4.14. Which is the stronger acid and why?
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Explanation:

7)

Given data:

Mass of aluminium = 2.5 g

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4Al + 3O₂   →   2Al₂O₃

Number of moles of Al:

Number of moles = mass/ molar mass

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                        0.09      :       2/4×0.09 = 0.045

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Percent yield:

Percent yield = actual yield / theoretical yield ×100

Percent yield =  3.47 g / 6.67 × 100

Percent yield = 52%

                       

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