Answer:
6.5
Step-by-step explanation:
We know we will need a balanced equation with masses and molar masses, so let’s gather all the information in one place.
M_r: 187.56 18.02
Cu(NO₃)₂·nH₂O ⟶ Cu(NO₃)₂ + nH₂O
m/g: 7.0 4.3
1. <em>Moles of Cu(NO₃)₂
</em>
Moles of Cu(NO₃)₂ = 4.3 g × (1 mol/187.56 g)
Moles of Cu(NO₃)₂ = 0.0229 mol
2. <em>Mass of H₂O
</em>
Mass of Cu(NO₃)₂·nH₂O = mass of Cu(NO₃)₂ + mass of H₂O
7.0 = 4.3 + x
7.0 - 4.3 = x
2.7 = x
3. <em>Moles of H₂O
</em>
Moles of H₂O = 2.7 g × (1 mol/18.02 g)
Moles of H₂O = 0.150 mol
4. <em>Value of n
</em>
The molar ratio is 1 mol (NO₃)₂ = n mol H₂O
n = moles H₂O/moles Cu(NO₃)2
n = 0.150/0.0229
n = 6.5
This answer does not make sense, because the maximum value of n in hydrated copper(II) nitrate is 6.
Answer:
number 7 is GROWTH
number 8 is TARGET CELLS
number 9 is pituitary gland
<span>Atoms move at different speeds depending on whether they are in liquids or solids </span><span>because the atoms or particles in solids are closely bonded while they are loosely bonded in liquids.
</span><span>
</span><span>
</span><span>The attractive forces between the particles are so high that they remain in fixed positions. The particles, then, cannot slip over the neighbors particles. They can only vibrate. That is why solids have definite form and volume.</span><span />
<span>That the particles in liquids are loosely bonded means that the attractive forces are less compared with solids. Then the partilces can move and pass each other. They are not in fixed arrangements any more. Yet the particles are attracted to each other, so they have definite volume, although they take the form of the vessel, and they can flow.
</span>
Answer:
b
Explanation:
the nucleus has an overall positive charge, the electron orbital consists of empty space, while the nucleus consists of neutrons and protons tightly packed together. The electron cloud occupies most of the total volume