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3 years ago

What sub-atomic particles make up the majority of the atomic mass (amu) of an atom?

Chemistry

1 answer:

FromTheMoon [43]3 years ago

5 0

Answer:

b. protons and neutrons

Explanation:

neutrons and protons constitute almost all of an atom's mass. The third type of stable particle is the electrons. Electrons have a negative charge but are extremely small and have a mass only 1/1850 that of a proton or neutron. They are so small that for practical purposes they do not contribute to the mass of the atom.

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What is the solubility (in g/L) of calcium fluoride at 25°C? The solubility product constant for calcium fluoride is 3.4 × 10–11

PilotLPTM [1.2K]

<u>Answer:</u> The correct answer is Option b.

<u>Explanation:</u>

The balanced equilibrium reaction for the ionization of calcium fluoride follows:

$CaF_2\rightleftharpoons Ca^{2+}+2F^-$

s 2s

The expression for solubility constant for this reaction will be:

$K_{sp}=[Ca^{2+}][F^-]^2$

We are given:

$K_{sp}=3.4\times 10^{-11}$

Putting values in above equation, we get:

$3.4\times 10^{-11}=(s)\times (2s)^2\\\\3.4\times 10^{-11}=4s^3\\\\s=2.04\times 10^{-4}mol/L$

To calculate the solubility in g/L, we will multiply the calculated solubility with the molar mass of calcium fluoride:

Molar mass of calcium fluoride = 78 g/mol

Multiplying the solubility product, we get:

$s=2.04\times 10^{-4}mol/L\times 78g/mol=159.12\times 10^{-4}g/L=0.015g/L$

Hence, the correct answer is Option b.

3 0

3 years ago

Write the balanced equation for the reaction between HCl and NaOH. Then, calculate the molarity of the NaOH.

andre [41]

Answer:

HCl (aq) + NaOH (aq) --> H2O (L) + NaCl (aq)

Explanation:

HCl is a strong acid while NaOH is a strong alkali. Hence both should dissociate completely in water and 1 mol of HCl will fully neutralise 1 mol of NaOH.

I'm assuming that Part 2 on molarity is part of a data based question that requires you to calculate the number of moles of NaOH based on the data provided and the equation that you are required to balance. Hence, I can't help you with it as I do not have the values.

5 0

3 years ago

Calculate the ΔG for the following system. Then state if the system is spontaneous or not spontaneous.

skad [1K]

+25 kJ; not spontaneous is your answer :) Hope this helps.

5 0

3 years ago

Read 2 more answers

Jack has a rock. The rock has a mass of 14 g and a volume of 2 cm3. What is the density of the rock? * 0 7 ml O 28 g/cm3 07 g/cm

jeyben [28]

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass of rock = 14 g

volume = 2 cm³

The density of the rock is

$density = \frac{14}{2} \\$

We have the final answer as

Hope this helps you

3 0

4 years ago

You are at your cabin in the woods. Will you be able to take a hot bath tonight if only 0.1 lb of propane remains in the tank? E

irina [24]

It depends on other factors to. techniqually this doesent take place in time so it could be that in the future that will be enough but you are probably right. most appliances could not heat water with .1 lb of propane. though it would be luke warm

8 0

3 years ago