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rusak2 [61]
3 years ago
9

What is the measurement 111.009 mm rounded off to four significant digits? a. 111 mm b. 111.0 mm c. 111.01 mm d. 110 mm Please s

elect the best answer from the choices provided
Chemistry
1 answer:
faltersainse [42]3 years ago
3 0
Four significant figures would be B. Because 0's before the decimal are not important, but 0's after the decimal are.
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How many moles are there in 8.50 X 1024 molecules of sodium sulfate, Na2SO3?
il63 [147K]

Answer:

<h2>14.12 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{8.50 \times  {10}^{24} }{6.02 \times  {10}^{23} }  \\  = 14.119601...

We have the final answer as

<h3>14.12 moles</h3>

Hope this helps you

3 0
3 years ago
How many moles of copper are in 6,000,000 atoms of copper?
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2 years ago
The nucleus of an atom is dense and positively charged. What was observed when positively charged particles were radiated onto a
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Particles that struck the center of the atom were repelled.

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8 0
3 years ago
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HELP! I WILL GIVE BRAINLIST!
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Answer:

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Explanation:

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3 years ago
What is the standard enthalphy change ΔHo, for the reaction represented above? (ΔHof of C2H2(g) is 230 kJ mol-1; (ΔHof of C6H6(g
wolverine [178]

Answer:

-608KJ/mol

Explanation:

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ΔHrxn= ΔHC6H6 - 3ΔHC2H2

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3 years ago
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