4
Numbers above zero are significant, as well as any zeros that appear in between two non-zero numbers.
I think it’s A. The force of the stirring
Answer:
50.96g
Explanation:
Given parameters:
Number of moles of H₃PO₄ = 0.52moles
Unknown:
Mass of the compound = ?
Solution:
To find the mass of the compound:
Mass = number of moles x molar mass of H₃PO₄
Molar mass of H₃PO₄ = 3(1) + 31 + 4(16) = 98g/mol
Mass = 0.52 x 98 = 50.96g
Answer:
0.15M
Explanation:
NaOH + HCl -->NaCl + H2O
moles of NaOH reacted with HCl
(0.5 × 30)/1000 = 1.5 × 10^ -3
so the moles of HCl reacted with NaOH
1.5 × 10^ -3
concentration of HCl = ( 1.5 × 10^ -3)/10 ×1000
Answer:
c. Ice, H₂O, has a solid structure with alternating H−O interactions.
e. HF has a higher boiling point than HCl.
Explanation:
For molecules to interact through hydrogen bonding, it is required that there is an H atom bonded to a more electronegative atom, such as N, O or F.
<em>Select the interactions that can be explained by hydrogen bonding. Check all that apply.
</em>
<em>
a. CH₄ molecules interact more closely in the liquid than in the gas phase. </em>NO. The electronegativity of C is not high enough to form hydrogen bondings.
<em>b. HF is a weak acid neutralized by NaOH.
</em> NO. This reaction occurs in water and it is better explained by ion-ion forces.
<em>c. Ice, H₂O, has a solid structure with alternating H−O interactions.
</em> YES. This structure is a consequence of the hydrogen bonding.
<em>d. H₂Te has a higher boiling point than H₂S.</em> NO. The electronegativities of Te and S are not high enough to form hydrogen bondings.
<em>e. HF has a higher boiling point than HCl.</em> YES. The stronger hydrogen bonding interactions in HF explain the higher boiling point.
