CHEMISTRY HIGH SCHOOL

Which statement is true about an empirical formula?1. It is the true ratio of atoms in a formula unit.
2. It is the simplest ratio of atoms in a formula unit.
3. It represents the true molecular mass of a chemical formula.
4. It represents the highest ratio of coefficients in a chemical formula.

Answers

Answer 1
Answer: The statement that is true about an empirical formula is it is the simplest ratio of atoms in a formula unit. The answer is number 2. The rest of the statements do not answer the question above.
Answer 2
Answer:

Answer:

2. It is the simplest ratio of atoms in a formula unit.

Explanation:

The empirical formula refers to how to provide the minimum proportion in which chemical elements combine into one substance. Sometimes it may happen that the minimum formula is equal to the molecular formula of the compound; However, this is not always true.  In short, the empirical formula refers to the simplest ratio of atoms in a unit of formula.

For example, the empirical or minimal formula of water is H2O, indicating that there is a 2: 1 ratio between the elements that make up water molecules. And, coincidentally, this is also the molecular formula of water.

Related Questions

What is a Benedict solution?
Which of the following substances would be the softest?CuO SiC C25H52 Zn
Elements occur in a number of isotopic forms. In this problem, you will learn about the notation used to distinguish different isotopes.How many protons Z and how many neutrons N are there in a nucleus of the most common isotope of silicon, 28/14Si?
Renewable energy resources such as wind andsolar energy have an advantage because theycannot be depleted.Agree or disagree
What is the molarity of 1.5 liters of an aqueous solution that contains 52 grams of lithium fluoride, LiF, (gram-formula mass = 26 grams/mole)?

Which activity performed by a chemist is primarily based on an understanding of physics?

Answers

physical science, is the study of the composition, structure, properties and change of matter.[1][2] Chemistry is chiefly concerned with atoms and their interactions with other atoms - for example, [ the properties of the chemical bonds formed between atoms to create chemical compounds. As well as this, interactions including atoms and other phenomena - electrons and various forms of energy—are

Which aqueous solution of KI freezes at the lowest temperature?(1) 1 mol of KI in 500. g of water
(2) 2 mol of KI in 500. g of water
(3) 1 mol of KI in 1000. g of water
(4) 2 mol of KI in 1000. g of water

Answers

The answer is (2) 2 mol of KI in 500. g of water.. This is a question of colligative properties. Boiling point elevation and freezing point depression depend on the concentration of dissolved solute. You would get the greatest concentration of KI with the largest moles of KI and smallest volume of water.

Consider the equation below. Zn + H2SO4 mc010-1.jpg ZnSO4 + H2 The mole ratio of zinc to zinc sulfate is

Answers

Answer: The mole ratio of zinc to zinc sulfate is 1:1.

Explanation:

Zn+ H_2SO_4\rightarrow ZnSO_4+H_2

According to reaction,1 mole of zinc reacts with 1 mole of sulfuric acid to give 1 mole zinc sulfate and 1 mole of hydrogen gas .

So, the mole ratio of zinc to zinc sulfate is:

\text{moles of}Zn:\text{moles of}ZnSO_4=1 mol:1 mol=1:1

Hence, the mole ratio of zinc to zinc sulfate is 1:1.
Zn=65 grams/mole
20 grams/ (65 grams/mole)=0.31 moles of zinc
The molar ratio of Zn and H2 is 1 to 1, so 0.31 moles of H2 are also produced. The ratio is the same for the sulfuric acid. H2SO4=2*1+32+16*4=98 grams/mole
(98 grams/mole)*0.31 moles=30.4 grams of H2SO4.

Consider three gases: Ar, SF6, and Cl2. If 50.0 grams of these gases are placed in each of three identical containers, which container will have the highest pressure? The volume and temperature of all three containers are the same.

Answers

The ideal gas law:
pV=nRT \Rightarrow p=(nRT)/(V)
p - pressure, n - number of moles, R - the gas constant, T - temperature, V - volume

The volume and temperature of all three containers are the same, so the pressure depends on the number of moles. The greater the number of moles, the higher the pressure.
The mass of gases is 50 g.

Ar \nM \approx 39.948 \ (g)/(mol) \nn=(50 \ g)/(39.948 \ (g)/(mol)) \approx 1.25 \ mol \n \nSF_6 \nM \approx 146.06 \ (g)/(mol) \nn=(50 \ g)/(146.06 \ (g)/(mol)) \approx 0.34 \ mol \n \nCl_2 \nM=70.9 \ (g)/(mol) \nn=(50 \ g)/(70.9 \ (g)/(mol)) \approx 0.71 \ mol

The greatest number of moles is in the container with Ar, so there is the highest pressure.

In what way would readings from a digital thermometer be preferable to those from a liquid-based thermometer?

Answers

A digital thermometer is more preferable than a liquid-based thermometer because it gives accurate data than the liquid thermometer. Liquid thermometer is affected by the temperature, and when it does, the liquid expands and so des the material covering the thermometer. For the digital thermometer, it has less error because it already has a sensor inside it that determines the temperature of the substance.

Given that the molar mass of naoh is 40.00 g/mol, what mass of naoh is needed to make 2.500 l of a 2.000 m naoh solution? use molarity equals startfraction moles of solute over liters of solution endfraction.. 0.1250 g 5.000 g 32.00 g 200.0 g

Answers

The mass of Sodium hydroxide which is needed to make 2.500 L of a 2.000 M NaOH solution is 200 grams.

How do we calculate mass from moles?

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given that, molarity of NaOH = 2M

Volume of NaOH solution = 2.5L

Moles of NaOH will be calculated by using the below equation as:

M = n/V

n = (2)(2.5) = 5 moles

Now we calculate the mass of NaOH of 5 moles as:

W = (5mol)(40g/mol) = 200g

Hence option (4) is correct.

To know more about moles, visit the below link:

brainly.com/question/15303663

Answer:

d

Explanation:
Other Questions
In a combustion reaction of C3H8 + 5O2 = 3CO2 + 4H2O, how do you know that the first compounds will produce the nuber of what they did? . Also how do you know that this 2Ca + O2= 2CaO?
Four acids are analyzed and their Ka values are determined. Which of the following values represents the strongest acid?
How many grams of oxygen can be created when you heat 200g of sodium chlorate
Calculate the density of argon gas at a pressure of 753 mmHg and a temperature of 35 °C