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Vitek1552 [10]
2 years ago
12

Please answer this question correctly i really need it. Be serious.

Chemistry
2 answers:
lina2011 [118]2 years ago
7 0

Answer:

The first one

Explanation:

kenny6666 [7]2 years ago
6 0

Answer:

I think A but to be fair if you get it wrong I am a 6th grader

Explanation:

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What is the molar mass of a gas which occupies 48.7 L at 111oC under 698 torr of pressure and has a mass of 21.5 grams?
seropon [69]

Answer:

Molar mass of the gas = 15.15 g/mol

Explanation:

PV = nRT

Where,

P = pressure

n = No. of moles

R = Gas constant

T = Temperature

P = 698 torr, 1 torr = 0.00131579 atm

698\;torr = 698\times0.00131579 = 0.9184\;atm

Temperature = 111 °C = 100 + 273.15 = 384.15 K

V = 48.7 L

R = 0.082057 L atm/mol K

Now, PV = nRT

n = \frac{PV}{RT}

n = \frac{0.9184\times48.7}{0.082057\times384.15}

          =1.4189 mol

Molar mass = Mass/ No. of  moles

                    = 21.5/1.4189

                    =15.15 g/mol

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3 years ago
When did Pangaea begin to break apart?
LUCKY_DIMON [66]
About 250 years ago ΩαΨ
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3 years ago
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Which of the following statements a about scientific hypothesis is false?
Pachacha [2.7K]

Answer:

The false statement from the given statements is option a.

Explanation:

Hypothesis:

A hypothesis is a intelligent guess or prediction to interpret or explain any phenomena.  

It is tested through the series of experiments and by number of studies to actually decide whether hypothesis is in agreement with observation and results predicted by it. These prediction are made on basis of limited evidences. It can be false or true.

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Answer:

Here, acceleration due to gravity(a) is assumed as 10m/s².We can also take it as 9.8m/s²

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How has the work of chemists advanced cancer treatment?​
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Answer:

C

Explanation:

it wouldn't be A because that makes no sense

theirs no pill or any type of drug that can slow it down but their is a treatment plan for it

(It could be c or d)

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