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Feliz [49]
2 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]2 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]2 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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Many power plants produce energy by burning carbon-based fuels, which also produces carbon dioxide. Carbon dioxide is a greenhou
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Answer:

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b) 1.124 mol/MJ;

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d) 0.1835 mol/MJ

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The enthalpy of a reaction is the sum of the enthalpy of the products (each one multiplied by the number of moles) less the sum of the enthalpy of the reactants (each one multiplied by the number of moles). The ΔH°f for simple substances (with one atom) is 0. The combustion is the reaction between the fuel and the oxygen.

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ΔH°rxn = -393.5 kJ/mol = -393.5x10⁻³ MJ/mol

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b) The combustion reaction is:

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)

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ΔH°f, O₂(g) = 0

ΔH°f, CH₄(g) = -74.8 kJ/mol

ΔH°rxn = [2*(-285.3 ) + 1*(-393.5)] - [1*(-74.8)]

ΔH°rxn = -889.3 kJ/mol = -889.3x10⁻³ MJ/mol

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d) C₈H₁₈(l) + (25/2)O₂(g) → 8CO₂(g) + 9H₂O(l)

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<h2>Answer:</h2>

The density of mercury molecule is higher than water.

<h3>Explanation:</h3>

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One reason for the differences in density between mercury and water is that the atomic mass of mercury is 200.59 grams per mole. The atomic mass of water is 18.0 grams per mole. This is because mercury has a larger nucleus than hydrogen or water.

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