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3 years ago

12

which of the following is the best choice for presenting the relationship between atomic number and atomic mass?

2 answers:

Oksana_A [137]3 years ago

8 0

Idk what’s the options but atomic number is the proton number. atomic mass is the bigger number

atomic number is the smaller number

Stella [2.4K]3 years ago

4 0

Answer:

Atomic number is the number of protons in an atom

Atomic mass is the mass of an atom.

Explanation:

which of the following is the best choice for presenting the relationship between atomic number and atomic mass?

Atomic number is the number of protons in an atom

Atomic mass is the mass of an atom.

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elena-14-01-66 [18.8K]

Answer:

the nights are shorter

Explanation:

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3 years ago

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Suppose you wanted to dissolve 40.0 g NaOH in enough H2O to make 6.00 dm3 of solution

dezoksy [38]

Molarity of solution = 1.6 M

<h3>Further explanation</h3>

Given

40 g NaOH

6 L solution

Required

Steps to solve the problem of molarity

Solution

No additional information about the question.

If you want to make the solution above, then we just need to put the existing NaOH (40 g) into 6 L of water, then do the stirring (in a warm temperature above the hot plate will speed up the NaOH dissolving process)

But if you want to know the molarity of a solution, then

1. we calculate the moles of NaOH

$\tt mol=\dfrac{mass}{MW}$

MW(molecular weight) of NaOH=

Ar Na+ Ar O + Ar H

23 + 16 + 1 = 40 g/mol

so mol NaOH :

$\tt mol=\dfrac{40~g}{40~g/mol}=1~mol$

2. Molarity(M)

$\tt M=\dfrac{n}{V}\\\\M=\dfrac{1}{6}\\\\M=0.16$

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3 years ago

After mixing sand with water, after awhile it settles to the bottom. WHY?

BigorU [14]

Answer:

Because the water is filled up with the sand every where

Explanation:

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4 years ago

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4 years ago

Potassium superoxide is a yellow paramagnetic solid that reacts with water according to the following balanced equation. Calcula

babunello [35]

<u>Answer:</u> The mass of potassium superoxide required is 142.2 grams

<u>Explanation:</u>

The chemical equation for the reaction of potassium superoxide with water follows:

$2KO_2+H_2O\rightarrow KOH+KHO_2+O_2;\Delta H=2405J$

Number of moles of potassium superoxide reacted = 2 moles for given amount of heat released

To calculate the mass for given number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Molar mass of potassium superoxide = 71.1 g/mol

Moles of potassium superoxide = 2 moles

Putting values in above equation, we get:

$2mol=\frac{\text{Mass of potassium superoxide}}{71.1g/mol}\\\\\text{Mass of potassium superoxide}=(2mol\times 71.1g/mol)=142.2g$

Hence, the mass of potassium superoxide required is 142.2 grams

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3 years ago