18 electrons. With a -2 charge, that means it gains two electrons.
Answer:
misteri Cell ini quest ia half-life of beauty of misteri best, of Cell can't answer =
Explanation:
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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
V( H₂SO₄) = 25.0 mL in liters = 25.0 / 1000 = 0.025 L
M(H₂SO₄) = ?
V(NaOH) = 50.0 mL = 50.0 / 1000 = 0.05 L
M(NaOH) = 0.150 M
number of moles NaOH :
n = M x V
n = 0.150 x <span> 0.05
</span>
n = 0.0075 moles of NaOH
H₂SO₄(aq) + 2 NaOH(aq) = Na₂SO₄(aq) + 2 H₂O(l)
1 mole H₂SO₄ ---------- 2 mole NaOH
? mole H₂SO₄ ---------- 0.0075 moles NaOH
moles = 0.0075 * 1 / 2
= 0.00375 moles of H₂SO₄
M(H₂SO₄) = n / V
M = 0.00375 / <span> 0.025
</span>= 0<span>.15 M
</span>
hope this helps!