CHEMISTRY HIGH SCHOOL

Properties that do not depend on the amount of matter present are called _________________.a.intensive property
b. extensive property

Answers

Answer 1
Answer:

the answer is b) extensive just took the test.
Answer 2
Answer:

Answer:

a.intensive property

Explanation:

Properties that do not depend on the amount of matter present are called


But B answer is not correct

chloetoder is wrong answer

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A student has a sample of isopropanol (C3H7OH) that has a mass of 78.6 g. The molar mass of isopropanol is 60.1 g/mol. How many moles of isopropanol are contained in this sample?

Answers

Answer : The number of moles of isopropanol are 1.308 moles.

Solution : Given,

Mass of isopropanol = 78.6 g

Molar mass of isopropanol = 60.1 g/mole

Formula used :

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

Now put all the given values in this formula, we get the number of moles of isopropanol.

\text{ Number of moles}=(78.6g)/(60.1g/mole)=1.308moles

Therefore, 1.308 moles of isopropanol are contained in this sample.
The thing we are asked to calculate here is the amount of the substance in the given sample in units of moles. To obtain this value, the molar mass of the substance is needed. Molar mass has the units of grams per mole so it is a useful value for converting mass into moles.

78.6 g ( 1mol / 60.1g) = 1.31 mol isopropanol

How many atoms are present in a sample of Calcium (Ca) weighing 127.38g?

Answers

Answer:

1.9139 × 10²⁴ atoms Ca

General Formulas and Concepts:

Chemistry - Atomic Structure

  • Reading a Periodic Table
  • Using Dimensional Analysis
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Explanation:

Step 1: Define

127.38 g Ca

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Ca - 40.08 g/mol

Step 3: Convert

127.38 \ g \ Ca((1 \ mol \ Ca)/(40.08 \ g \ Ca) )((6.022 \cdot 10^(23) atoms \ Ca)/(1 \ mol \ Ca) ) = 1.91388 × 10²⁴ atoms Ca

Step 4: Check

We are given 5 sig figs. Follow sig fig rules and round.

1.91388 × 10²⁴ atoms Ca ≈ 1.9139 × 10²⁴ atoms Ca

Calculate the number of atoms of carbon in 3.8 moles of methane (CH4)

Answers

Total, 2.28916 × 10²⁴ atoms of carbon in 3.8 moles of methane.

To calculate the number of atoms of carbon in 3.8 moles of methane (CH₄), we need to consider the molecular formula of methane, which is CH₄. This indicates that each molecule of methane contains one carbon atom (C) and four hydrogen atoms (H).

First, let's find total number of carbon atoms in 3.8 moles of methane:

Number of moles of carbon in 1 mole of methane (CH₄) = 1 mole (because there is 1 carbon atom in each molecule of CH₄)

Number of moles of carbon in 3.8 moles of methane = 3.8 moles

Now, we'll use Avogadro's number to convert moles to the number of atoms:

Avogadro's number (NA) = 6.022 × 10²³ atoms/mol

Number of carbon atoms in 3.8 moles of methane = 3.8 moles × Avogadro's number

Number of carbon atoms in 3.8 moles of methane = 3.8 moles × 6.022 × 10²³ atoms/mol

Now, let's calculate:

Number of carbon atoms in 3.8 moles of methane ≈ 2.28916 × 10²⁴ atoms

So, there are approximately 2.28916 × 10²⁴ atoms of carbon in 3.8 moles of methane.

To know more about carbon atoms here

brainly.com/question/30507533

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There are 6.02*10^23 molecules per mole substances. And there is one carbon atom per molecule of CH4. So the atoms number is 3.8*6.02*10^23=2.29*10^24.

Consider the following equation: 4NH₄ + 5O₂ → 4 NO + 6H₂O

How many moles of water are produced when 2 moles of NH4 react with excess Oxygen gas?

Answers

The moles of water are produced when 2 moles of NH4 react with excess Oxygen gas is 4 mole of H2O.

What is moles?

Moles are defined as a common unit used in science to measure vast numbers of extremely small things, such atoms, molecules, or other specific particles.

It can also be defined as a metric in chemistry that is used to describe a very high quantity of molecules, atoms, or particles.

Since we only have two moles of NH4, we switch out four for two.

2 NH4 + 3O2 --> 2NO + 4 H2O

As per the reaction, in order to produce 2 moles of NO2 and 4 moles of H2O, 2 moles of NH4 must react with 3 moles of oxygen gas.

Thus, the moles of water are produced when 2 moles of NH4 react with excess Oxygen gas is 4 mole of H2O.

To learn more about moles, refer to the link below:

brainly.com/question/26416088

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see we have two moles of NH4, so we replace 4 NH4 by 2 NH4.
Now, on balancing the equation, we get 2 NH4 + 3O2 ---> 2NO + 4 H2O (law of conservation of mass)
thus, 2 moles of NH4 react with 3 moles of oxygen gas to produce 2 moles of NO2 and 4 moles of H2O.
Thus, we get 4 moles of H2O 

What are three types of fossil fuels?

Answers

The three types of fossil fuels are coal, oil and natural gas.

Which type of radiation is identical in mass and charge to a helium nucleus?a. beta
b. alpha
c. proton
d. positron

Answers

The correct answer is option B. Alpha radiation is identical in mass and charge to a helium nucleus. Alpha particle contains two protons and neutrons. It is the same as giving out a doubly-ionized helium atoms.
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