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3 years ago

Write 454.12kg with 3 significant

Mathematics

1 answer:

s344n2d4d5 [400]3 years ago

6 0

Answer: 454

Step-by-step explanation:

The first three digits will be the significant digits. Round the third digit.

454.12

the digit and the 4 is 1 so 454.12 is rounded to 454

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2 years ago

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3 years ago

What is the mass (in grams) of 8.11×1026 CO2 molecules?

Kobotan [32]

Answer:

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Step-by-step explanation:

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$= (12 \times 1) + (16 \times 2) \\ = 12 + 32 \\ = 44 \: g$

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• From avogadro's number, it says 1 mole contains 6.02 × 10^23 molecules or atoms.

But 1 mole is equivalent to its molar mass in terms of weight, therefore;

${ \sf{6.02 \times {10}^{23} \: molecules = 44 \: g }}\\ { \sf{8.11 \times {10}^{26} \: molecules =( \frac{8.11 \times {10}^{26} }{6.02 \times {10}^{23} } \times 44) \: g}} \\ \\ = { \boxed{ \boxed{ \bf{59275.7 \: \: g}}}}$

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3 years ago