How many molecules of CO2 are present

Chemistry

1 answer:

allochka39001 [22]3 years ago

6 0

Where’s the question or equation

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The accepted value for the percent by mass of water in a hydrate is 36.0%. In a laboratory activity, a student determined the pe

valentina_108 [34]

The original or accepted value for the percent by mass of water in a hydrate = 36%
Percen by mass of water in the hydrate determined by the student
in the laboratory = 37.8%
So the difference between the actual and the percent by mass in water determined by student = (37.8 - 36.0)%
   = 1.8%
So the percentage of error made by the student = (1.8/36) * 100 percent
   = (18/360) * 100 percent
   = ( 1/20) * 100 percent
      = 5 percent
So the student makes an error of 5%. Option "1" is the correct option.

4 0

3 years ago

In an atom the number of electron is what as the number of protons???

nydimaria [60]

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons.

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2 years ago

Swer all parts. (a) What is the wavelength (in nm) of radiation that has an energy ...

bagirrra123 [75]

Answer:

a) The wavelength is around 33.8 nm = 3.38*10⁻¹ nm

b) Ultraviolet

Explanation:

a) The energy (E) of a photon is related to its wavelength (λ) by the Planck's equation:

$E = h\frac{c}{\lambda}----(1)$