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Mrac [35]
2 years ago
15

I need help with the blanks

Chemistry
1 answer:
Damm [24]2 years ago
3 0

Answer:

photo is blurred plese send photo clearly

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How does the idea of a neutron help address the puzzles about the protons in the nucleus and the mass of atoms?
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Answer:

hen the number of neutrons is known and the atomic number of an element is known, it becomes easier to determine the approximate mass number by adding the two.

Explanation:

Hope it shelps

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A car averages 27.5 miles per gallon
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A chemical reaction takes place in which energy is released. Arrange the reaction’s characteristics in order from start to finis
Aliun [14]
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4 0
3 years ago
How many grams of water are required to produce 5.50L of hydrogen gas at 25.0 degrees C and 755mmHg?
stiv31 [10]

Answer is: 4.02 grams of water are required.
Chemical reaction: BaH₂ + 2H₂O → Ba(OH)₂ + 2H₂.
Ideal gas law: p·V = n·R·T.
p = 755 mm Hg ÷ 760.0 mmHg / atm = 0.993 atm.
T = 25 + 273.15 = 298.15 K.
V(H₂) = 5.50 L.
R = 0,08206 L·atm/mol·K.
n(H₂) = 0.993 atm · 5.5 L ÷ 0,08206 L·atm/mol·K · 298.15 K.
n(H₂) = 0.223 mol.
From chemical reaction: n(H₂O) : n(H₂) = 1 : 1.
n(H₂O) = 0.223 mol.
m(H₂O) = 0.223 mol · 18 g/mol.
m(H₂O) = 4.02 g.
3 0
3 years ago
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