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Anna71 [15]
2 years ago
7

How many moles of Ca(NO3)2 are needed to make 1.50 L of a 6.00 molar solution?

Chemistry
1 answer:
irga5000 [103]2 years ago
4 0

Answer:

9.0 moles Ca(NO₃)₂

Explanation:

from definition of Molarity = moles of solute / volume of solution in liters

=> moles = Molarity x Volume(L) = 6.00 molar x 1.5 liters = 9.0 moles Ca(NO₃)₂

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The isotope of an atom containing 31 protons and 39 neutrons suddenly has two neutrons added to it.
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Answer:

Gallium-72

Explanation:

The elements are identified by the number of protons of the atom, which is its atomic number.

In this case the number of protons 39 (atomic number 39) permit you to identify the element as gallium.

Now, to identify the isotope you tell the name of the element and add the mass number.

The mass number is the sum of the protons and the neutrons

In this case, the number of neutrons is the original 39 plus the 2 added suddenly, i.e. 39 + 2 = 41, so the mass number is 31 + 41 = 72

Therefore, the isotope is gallium - 72.

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When a solid changes to gas, what is it called??
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Which of the following pairs of elements is most likely to form an ionic bond?
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What is the wavelength of a photon with an energy of 3.50 x 10^-19 J ?
Leokris [45]

Answer:

λ = 5.68×10⁻⁷ m

Explanation:

Given data:

Energy of photon = 3.50 ×10⁻¹⁹ J

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Solution:

E = hc/λ

h = planck's constant = 6.63×10⁻³⁴ Js

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Now we will put the values in formula.

3.50 ×10⁻¹⁹ J =  6.63×10⁻³⁴ Js × 3×10⁸ m/s/ λ

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λ =  19.89×10⁻²⁶ J.m / 3.50 ×10⁻¹⁹ J

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2 years ago
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