Butter has a specific gravity of 0.86. What is the mass of 2.15 L of butter?
1 answer:
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Answer :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule. The electrons are represented by dot.
The given molecule is, perbromate ion.
Bromine has '7' valence electrons and oxygen has '6' valence electron.
Therefore, the total number of valence electrons in perbromate ion, = 7 + 4(6) + 1 = 32
According to Lewis-dot structure, there are 14 number of bonding electrons and 18 number of non-bonding electrons.
Formula for formal charge :
The Lewis-dot structure of perbromate ion is shown below.
Answer:
0.01125 moles of can be produced from 115 mL of 0.218 M
.
Explanation:
Moles of = n
Volume of the solution = 115 mL = 0.115 L ( 1 mL=0.001 L)
Molarity of the solution = 0.218 M
According to reaction, 3 moles gives 1 mole of
.Then 0.03379 moles of
will give :
0.01125 moles of can be produced from 115 mL of 0.218 M
.
Answer:
a) 250 N
b) 50 N
c) 5000 J
d) 4
e) 3.33
Explanation:
Given that weight of piano () = 1000 N, distance moved by pulley (
) = 5 m and the rope used (
) =20 m
a) The effort applied () if it was an ideal machine is:
b) If the actual effort = 300 N
The force to overcome friction = actual effort - = 300 - 250 = 50 N
c) Work output =
d) ideal mechanical advantage (IMA) =
e) Input force = 300 N, Therefore:
actual mechanical advantage = / input force = 1000 / 300 = 3.33