Answer is: 4.02 <span>grams of water are required.
</span>Chemical reaction: BaH₂ + 2H₂O → Ba(OH)₂ + 2H₂.
Ideal gas law: p·V =
n·R·T.<span>
p = 755 mm Hg </span>÷ 760.0 mmHg / atm = 0.993<span> atm.
T = 25 + 273.15 = 298.15 K.
V(H</span>₂) <span>= 5.50 L.
R = 0,08206 L·atm/mol·K.
n(H</span>₂)
= <span>0.993 atm · 5.5 L ÷ 0,08206 L·atm/mol·K · 298.15 K.
n(H</span>₂)
= 0.223 mol.<span>
From chemical reaction: n(H</span>₂O) : n(H₂) = 1 : 1.<span>
n</span>(H₂O) = 0.223 mol.<span>
m</span>(H₂O) =
0.223 mol · 18 g/mol.<span>
m</span>(H₂O) =
4.02 g.
Density is equal to the mass of the substance per volume it occupies. In ths case, the density of gold from literature is 19,300 kg/m3 or 19.3 g/cm3. Given the volume of <span>4.20cm^3 , the mass is obtained by multiplying density and volume to get 81.06 grams of gold</span>
Answer:
b. primitive cubic < body-centered cubic < face-centered cubic
Explanation:
The coordination number is defined as <em>the number of atoms (or ions) surrounding an atom (or ion) in a crystal lattice</em>. Its value gives us a measure of how tightly the spheres are packed together. The larger the coordination number, the closer the spheres are to each other.
- In the <u>primitive cubic</u>, each sphere is in contact with 6 spheres, so its <u>coordination number is 6</u>.
- In the <u>body-centered cubic</u>, each sphere is in contact with 8 spheres, so its <u>coordination number is 12</u>.
- In the <u>face-centered cubic</u>, each sphere is in contact with 12 spheres, so its <u>coordination number is 12</u>.
Therefore, the increasing order in density is the primitive cubic first, then the body-centered cubic, and finally the face-centered cubic.
The rule of solubility states that, like dissolves like. Water is a polar compound. Hence compound that is most polar, will dissolve maximum in water.
Among to available options, ethanol has maximum polarity. Hence, its solubility will be maximum in water.
Other solvents like benzene, toluene and carbon tetrachloride are non-polar in nature. Hence, they show poor solubility in water.
Answer:
4.75 moles of oxygen would be consumed by water
Explanation:
Given data:
Mass of water produced = 68.1 g
Number of moles of oxygen consumed = ?
Solution:
Chemical equation:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 68.1 g/ 18 g/mol
Number of moles = 3.8 mol
Now we will compare the moles of water with oxygen.
H₂O : O₂
4 : 5
3.8 : 5/4×3.8 = 4.75 mol