The phase change H₂(g) → H₂(s) is called deposition, and the enthalpy change, ΔH, for this phase change has a negative (-) sign.
Deposition<span> is a </span>thermodynamic process<span> in which </span>gas<span> transforms into </span>solid<span> without passing through the </span>liquid phase<span>. Example is formin snow in clouds directly from water vapor. In deposition energy is released.</span>
C most likely sorry if I’m wrong
The mass of Be(NO₃)₂ needed to have precisely 0.670 mole of the compound is 89.11 grams
0.670 moles of beryllium nitrate, Be(NO₃)₂ is needed for the chemical reaction. The mass of Be(NO₃)₂ needed to have precisely 0.670 moles of the compound can be calculated as follows:
<h3>Molecular mass:</h3>
Molecular mass is a number equal to the sum of the atomic masses of the atoms in a molecule.
molecular mass of Be(NO₃)₂ = 9 + 14(2) + 16(6) = 9 + 28 + 96 = 133 grams per mole
Therefore,
1 mole of Be(NO₃)₂ = 133 grams
0.670 moles = ?
cross multiply
mass required = 0.670 × 133
mass of Be(NO₃)₂ required = 89.11 grams
learn more on mass here:brainly.com/question/26177156
Answer:
1) 1 N2 + 3 H2 2 NH3
2) 2 KClO3 2 KCl + 3 O2
Explanation:
That would help!! Stay safe
7 days i think. but not sure about this answer.