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Gemiola [76]
3 years ago
7

Which of these measurements was made with the most precise measuring device: 8.1956m, 8.20m, or 8.196m?

Chemistry
2 answers:
tigry1 [53]3 years ago
8 0
If I’m correct I believe it’s 8.1956m.
grandymaker [24]3 years ago
7 0

Answer:

8.1956m

Explanation:

8.1956m is the most accurate due to the fact that there is more decimal places in the measurement than the other two.

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How do scientists test their ideas
blondinia [14]

Answer:

They test it using the scientific method.

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3 years ago
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What volume (in L) will a 32 g sample of butane gas, C4H10(g), occupy at a temperature of 45.0 oC and a pressure of 728 mm Hg?
larisa86 [58]

Answer:

15.0 L

Explanation:

To find the volume, you need to use the Ideal Gas Law:

PV = nRT

In this equation,

-----> P = pressure (mmHg)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas constant (62.36 L*mmHg/mol*K)

-----> T = temperature (K)

To calculate the volume, you need to (1) convert grams C₄H₁₀ to moles (via the molar mass), then (2) convert the temperature from Celsius to Kelvin, and then (3) calculate the volume (via the Ideal Gas Law).

Molar Mass (C₄H₁₀): 4(12.011 g/mol) + 10(1.008 g/mol)

Molar Mass (C₄H₁₀): 58.124 g/mol

32 grams C₄H₁₀              1 moles
-------------------------  x  -----------------------  = 0.551 moles C₄H₁₀
                                    58.124 grams

P = 728 mmHg                      R = 62.36 L*mmHg/mol*K

V = ? L                                    T = 45.0 °C + 273.15 = 318.15 K

n = 0.551 moles

PV = nRT

(728 mmHg)V = (0.551 moles)(62.36 L*mmHg/mol*K)(318.15 K)

(728 mmHg)V = 10922.7632

V = 15.0 L

6 0
2 years ago
An unknown substance has the following properties:
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Answer:

Homogenous mixture

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Homogenous mixtures like ice cream appear to be uniform, and you cannot see their individual components.

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zaharov [31]
True. A mole of anything has the same amount of molecules. 1 mole = 6.022 x 1023 molecules 
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What does the symbol "E3" represent?
Anna71 [15]

Answer:

your answer to your question is B

6 0
3 years ago
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