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3 years ago

5

Why must humans find substitutes for many minerals found on Earth? (A) form at an extremely slow rate (B) controlled by other co

untries (C) too deep in the Earth to collect

1 answer:

DochEvi [55]3 years ago

3 0

The correct answer is C, too deep in the Earth to collect. Hope this helps!

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The science of using tree rings to determine absolute age is called

leva [86]

Option c. dendrochronology

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3 years ago

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What is the nuclear binding energy of an atom that has a mass defect of 5.0446 x 10-29 kg?

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2 years ago

What is the pressure in millimeters of mercury of 0.0130 molmol of helium gas with a volume of 210. mLmL at 55 ∘C∘C? (Hint: You

juin [17]

Answer : The pressure of the helium gas is, 1269.2 mmHg

Explanation :

To calculate the pressure of the gas we are using ideal gas equation:

$PV=nRT$

where,

P = Pressure of $He$ gas = ?

V = Volume of $He$ gas = 210. mL = 0.210 L (1 L = 1000 mL)

n = number of moles $He$ = 0.0130 mole

R = Gas constant = $0.0821L.atm/mol.K$

T = Temperature of $He$ gas = $55^oC=273+55=328K$

Putting values in above equation, we get:

$P\times 0.210L=0.0130mole\times (0.0821L.atm/mol.K)\times 328K$

$P=1.67atm=1269.2mmHg$

Conversion used : (1 atm = 760 mmHg)

Thus, the pressure of the helium gas is, 1269.2 mmHg

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3 years ago