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Ksenya-84 [330]
3 years ago
11

23. On the periodic table, there are two numbers in the block for the element potassium, K: 19 and 39.098. What are the names of

the numbers and what do they measure?
Chemistry
2 answers:
pshichka [43]3 years ago
5 0
Atomic number (19) measures how many protons it has
mass number (39.098) average of all the isotopes for potassium. as well as the number of protons + neutrons
pishuonlain [190]3 years ago
4 0
<h2>Answer: </h2>

Atomic number and atomic mass respectively.

<h3>Explanation: </h3>
  • The number 19 means the atomic number of K. Atomic number is the number of electrons or protons in an atom.
  • The number 39.098 indicates the atomic mass of the K.
  • Atomic mass is the mass of an atom which is approximately equal to total number of protons and neutrons in the nucleus of K.

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What is the mole ratio of NH3 to N2?
Ksenya-84 [330]
To answer this question a balanced chemical equation is necessary. The correct equation is: N2 + 3H2 = 2NH3
From this equation, one mole of nitrogen react with 3 moles of hydrogen to give 2 moles of ammonia.
Therefore, the mole ratio of NH3 to N2 is 2:1
8 0
3 years ago
Mass = 35g Volume = 7cm³ What is the Density?​
gizmo_the_mogwai [7]

Answer:

The answer is

<h2>5.0 g/cm³</h2>

Explanation:

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

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

From the question

mass = 35 g

volume = 7 cm³

The density is

density =  \frac{35}{7}  \\

We have the final answer as

<h3>5.0 g/cm³</h3>

Hope this helps you

7 0
4 years ago
Calculate how many moles of NH3 form when each quantity of reactant completely reacts according to the equation:
Leya [2.2K]
<span>1) Use the balanced chemical equation to find the molar ratios (proportions) of each product and reactant.

3N2H4(l)→4NH3(g)+N2(g)

=> molar ratios: 3 mol N2H4 : 4 mol NH3

2) Use the product to reactant molar ratio, and the quantity of reactant to determine the yield:

2.0 mol N2H4 * [4mol NH3] / [3mol N2H4] = 2*4/3 mol NH3 = 2.7 mol NH3

Answer: 2.7 mol
 
</span>
8 0
3 years ago
A compound whose water solution conducts electricity and turns phenolphthalein pink is
Ede4ka [16]

Answer:

The compound is an <em>alkali</em>

Explanation:

Although acids and bases in solution can conduct electricity due to the presence of free ions available to carry charges, bases or alkalis turn phenolphthalein indicator pink; as opposed to acids which give colourless test on the indicator.

The anayte compound is therefore a concentrated alakli solution.

4 0
3 years ago
Both the acetamido (-NHCOCH3) and bromo (-Br) substituents are ortho, para directors. Even though the acetamido group is much la
sweet [91]

Answer:

Explanation has been given below

Explanation:

  • Attachment of -Cl group at ortho position to acetamido group can be explained in terms of hydrogen bonding formation.
  • A hydrogen bonding can be formed between proton attached with N atom in acetamido group and Cl atom at ortho position. This leads to a formation of a stable 5-membered ring structure.
  • Hence ortho substitution by Cl is favorable process.
  • There is no hydrogen bonding possible between Br and Cl atom in ortho position. Therefore Cl prefers para position to avoid steric hindrance.
  • Structure of hydrogen bonded structure has been shown below.

8 0
3 years ago
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