3 years ago

Which of the following measurements is expressed to three significant figures?

Chemistry

1 answer:

tiny-mole [99]3 years ago

8 0

D. is the answer
hope i could help

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A compound is 40% carbon, 6.7% hydrogen, and 53.3% oxygen. What is the empirical formula?

Ahat [919]

Answer:

O H C

Moles in 100g 3.33 6.65 3.33

Ratio 1.00 2.00 1.00

Possible empirical formula = $OH_{2}C$

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3 years ago

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How many molecules of sulfur trioxide are in 78.0 grams?

zalisa [80]

Answer:

b) 5.87 E23 molecules

Explanation:

∴ mm SO3 = 80.066 g/mol

⇒ molecules SO3 = (78.0 g)(mol/80.066 g)(6.022 E23 molec/mol)

⇒ molec SO3 = 5.866 E23 molecules SO3

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3 years ago

As a cooking method, braising is valued for its A. ability to retain flavor. B. quickness and convenience. C. simplicity and ver

LiRa [457]

Answer:

i belevie its A

Explanation:

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3 years ago

How many atoms of carbon are combined to with 2.81 moles of hydrogen atoms in a sample of the compound ethane, C2H6?

puteri [66]

Answer:

5.64×10²³ atoms C

Explanation:

Convert moles of H to moles of C:

2.81 mol H × (2 mol C / 6 mol H) = 0.937 mol C

Convert moles of C to atoms of C:

0.937 mol C × (6.02×10²³ atoms C / mol C) = 5.64×10²³ atoms C

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4 years ago

The _______________________________________ is often referred to as the powerhouse of the cell

almond37 [142]

Answer:

Mitochondria

Explanation:

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