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LekaFEV [45]
3 years ago
14

in the reaction, Al2O3 + 6 HCl → __________H2O + 2AlCl3, what coefficient should be placed in front of H2O to balance the reacti

on?
Chemistry
2 answers:
Tamiku [17]3 years ago
6 0
You should put a 3. That way there are 6 H and 3 O on each side.
tangare [24]3 years ago
6 0
Al2O3 + 6HCl ------> 3H2O + 2AlCl3
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What is the correct term for blocked sunlight and reduced solar radiation as a result of a volcanic eruption?
Anvisha [2.4K]
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3 years ago
suppose medical records indicate that the length of newborn babies (in inches) is normally distributed with a mean of 20 and a s
Tanya [424]

Answer:

  • <u>0.6826 (68.26%)</u>

Explanation:

<u>1) Find the z-scores:</u>

  • z = [X - μ ] / σ

a) z-score for 22.6 inches length

  • X = 22.6
  • μ = 20
  • σ = 2.6

  • z = [ 22.6 - 20 ] / 2.6 = 1.00

b) z-score for 17.4 inches length

  • X = 17.4
  • μ = 20
  • σ = 2.6

  • z = [ 17.4 - 20 ] / 2.6 =  - 1.00

<u>2) Probability</u>

Then, you have to find the probability that the length of an infant is between - 1.00 and 1.00 standards deviations (σ) from the mean (μ).

That is a well known value of 68%, which is part of the 68-95-99.7 empirical rule.

The most exact result is obtained from tables and is 68.26%:

  • 1 - P (z ≥ 1.00) - P (z ≤ - 1.00) = 1 - 0.1587 - 0.1587 = 0.6826 = 68.26%
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3 years ago
Give the name of the prefix and the quantity indicated by the following symbols that are used with SI base units.
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Answer:

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B. Deci, 0.1 or 10*-1

C. Giga, 10*9

D. Kilo, 10*3

E. Milli, 10*-3

F. Nano, 10*-9

G. Pico, 10*-12

H. Tera, 10*12

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