3 years ago

Which statement is true about a catalyst?

Chemistry

1 answer:

mixas84 [53]3 years ago

8 0

Answer:

Option B: It remains unused during the reaction

Explanation:

Just took the test and got it right.

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4vir4ik [10]

Molar mass of CHCl3 is

sum of atomic mass of all the atoms in it.

= C + H + 3 Cl

= 12.0107 + 1.008 + 3 (35.453) = 2.0107 + 1.008 + 106.359

= 119.38 g/mol

Molar mass of CHCl3 is 119.38 g/mol

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3 years ago

How many moles are there in a 1.80 kg bottle of water?

yuradex [85]

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Its B. I got it right so do B.

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What is the energy of a photon having a wavelength of 2.60 ✕ 10-8 m?<br> J

zvonat [6]

The energy of a photon : 7.645 x 10⁻³⁴ J

<h3>Further explanation </h3>

Radiation energy is absorbed by photons

The energy in one photon can be formulated as

$\large{\boxed{\bold{E\:=\:h\:.\:f}}}$

Where

h = Planck's constant (6,626.10⁻³⁴ Js)

f = Frequency of electromagnetic waves

f = c / λ , Hz

c = speed of light

= 3.10⁸ m/s

λ = wavelength ,m

wavelength λ of 2.60 ✕ 10⁻⁸ m

The energy :

$\tt E=h.\dfrac{c}{\lambda}\\\\E=6.626.10^{-34}\times \dfrac{3\times 10^8}{2.6\times 10^{-8}}\\\\E=7.645\times 10^{-34}~J$

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olga_2 [115]

The mass is 224 grams of NaOH

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