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liberstina [14]
3 years ago
14

What is the pressure, in atmospheres, of 6.0 grams of H2 gas if it has a volume of 73 liters when the temperature is 25 C?

Chemistry
1 answer:
Archy [21]3 years ago
5 0
PV = nRT   (where P = pressure; V = volume; n = number of moles; R = gas constant; T = Temperature)

Moles of H₂ = mass of H₂ ÷ molar mass of H₂
                    =  6.0 g ÷ 2 g/mol
                    =  3.0 mol

To get the answer in atmospheres, let's convert C to K 
      25 °C ≡ 298 K

Now, based on the formula above
     P = (nRT) ÷ V

    P = (3.0 mol × (0.082 L · atm/mol · K) × 298 K) ÷  73 L
       ≈  1 .004 atm
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Four people weigh a standard mass of 10.00g on the same balance. Which of the following sets of readings suggests measurements t
Svetach [21]
An example of accurate but not precise would be 3 people weigh a 10g sample. the weights are 0g, 10g, & 20 grams. the scale is way off but the weights average to the right thing.
precise but not accurate would weighing a 10g sample 3 times and getting 5.5, 5.4, & 5.5. they'e all incredibly similar therefore precise but its nowhere near 10, so not accurate. 
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5 0
3 years ago
Find the "density" of a copper sample whose mass is 134.4 grams and whose volume is 15.0mL
Sonja [21]

Answer:

8.96 g/mL

Explanation:

density = mass / volume

density = 134.3g / 15.0 mL

density = 8.96 g/mL

3 0
2 years ago
A compound has an empirical formula of SO3 and a molecular mass of 152. What is the molecular formula?
Anettt [7]

Answer:

Molecular formula = S₂O ₆

Explanation:

Given data:

Empirical formula = SO₃

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Solution:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass  = 80 g/mol

n = 152 g/mol / 80 g/mol

n = 2

Molecular formula = n (empirical formula)

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5 0
3 years ago
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Elena L [17]
I’m not sure but I hope someone tell you

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8 0
3 years ago
Does the total volume of substances remain the same when they are combined? Support your conclusion with evidence.
s344n2d4d5 [400]

Answer:

I believe the answer is, 'If mass remains the same while the volume of a substance increases, the density of the substance will decrease.'

explanation: density= mass divided by volume, meaning that volume and density are inversely proportionate.  

Explanation:

7 0
3 years ago
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