CHEMISTRY HIGH SCHOOL

How much energy is required to raise 10.0 grams of water (c=4.18j/gC) by 20*C?

Answers

Answer 1

Answer:

Answer:

Q = 836 J

Explanation:

Given data:

Mass of water = 10.0 g

Temperature increased =ΔT = 20°C

Specific heat capacity of water = 4.18 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Q = 10.0 g × 4.18 J/g.°C × 20°C

Q = 836 J

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The atomic mass of an element is calculated using the(1) atomic number and the ratios of its naturally occurring isotopes(2) atomic number and the half-lives of each of its isotopes(3) masses and the ratios of its naturally occurring isotopes(4) masses and the half-lives of each of its isotopes

Calculate the mass percent of hydrogen in diethyl ether. Round your answer to the nearest percentage.

Answers

Diethyl ether has a molecular formula of C4H10O, which means it contains 2 hydrogen atoms per molecule.

To calculate the mass percent of hydrogen in diethyl ether, we need to know the molar mass of hydrogen and the molar mass of diethyl ether. The molar mass of hydrogen is approximately 1 g/mol, while the molar mass of diethyl ether is approximately 74 g/mol.

The mass percent of hydrogen can be calculated using the following formula:
mass percent of hydrogen = (mass of hydrogen / total mass of compound) x 100%

Substituting the values for diethyl ether, we get:
mass percent of hydrogen = (2 x 1 g/mol / 74 g/mol) x 100% = 2.7%

Therefore, the mass percent of hydrogen in diethyl ether is approximately 2.7%.

Final answer:

The mass percent of hydrogen in diethyl ether is 1.36%.

Explanation:

To calculate the mass percent of hydrogen in diethyl ether, we need to determine the mass of hydrogen in the compound and divide it by the total mass of diethyl ether. The formula of diethyl ether is C4H10O, so the molar mass is 74.12 g/mol. The molar mass of hydrogen is 1.008 g/mol.

Mass percent of hydrogen = (mass of hydrogen / mass of diethyl ether) × 100%

Mass percent of hydrogen = (1.008 g/mol / 74.12 g/mol) × 100% = 1.36%

Learn more about mass percent of hydrogen here:

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Explanation of atomic radius

Answers

Ah yes.

The atomic radius is basically the distance between the nucleus of the atom and the outermost electron in the farthest orbital of the atom. The more bigger the atomic radius , the less powerful is the force that holds together the nucleus and its electrons.

What would be the mass of Iron(II) chloride obtained when 450g of Sodium Chloride is added to Iron(II) oxide?

Answers

Answer:

FeO(s)+2NaCL(aq)>FeCL2(aq)+Na2O(s)

2 moles of sodium chloride react with 1 mole of iron (II) oxide to give 1 mole of iron (II) chlorine

mole ratio NaCl :FeCl=2:1

mass of FeCl=0.5×450=225g

Explanation:

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The recipe for pumpkin pie calls for 3 tablespoons of flour and 1.5 cups of sugar for each pie. Which of the following conversion factors would be used to find out how many pies could be made from 7.5 cups of sugar.

Answers

Answer:

5 pumpkin pies could be made with 7.5 cups of sugar.

Explanation:

The conversion factor to solve the problem is:

$7.5 cups of sugar*(1 pie)/(1.5 cups of sugar) = 5 pies$

Ethanol and dimethyl ether have different chemical and physical properties because they have different(1) functional groups
(2) molecular masses
(3) numbers of covalent bonds
(4) percent compositions by mass

Answers

The correct answer is option 1. Ethanol and dimethyl ether have different chemical and physical properties because they have different functional groups. Ethanol is an alcohol while the latter is an ether. They have different functional groups and different structures thus different properties.

The amount of oxygen formed when 12.26 g of KClO3 is heated is ________.

Answers

Answer:

approximately 4.8 grams of oxygen gas is formed.

Explanation:

To determine the amount of oxygen (O2) formed when 12.26 grams of potassium chlorate (KClO3) is heated, we need to consider the chemical reaction that occurs during this process. When KClO3 is heated, it decomposes into potassium chloride (KCl) and oxygen gas (O2).

The balanced chemical equation for this reaction is:

2 KClO3(s) → 2 KCl(s) + 3 O2(g)

From the equation, we can see that 2 moles of KClO3 produce 3 moles of O2.

Calculate the molar mass of KClO3:

K: 39.10 g/mol

Cl: 35.45 g/mol

O: 16.00 g/mol

Molar mass of KClO3 = (39.10 + 35.45 + 3 * 16.00) g/mol = 122.55 g/mol

Calculate the number of moles of KClO3 in 12.26 grams:

Moles of KClO3 = (12.26 g) / (122.55 g/mol) = 0.1 moles

Now, we can determine the number of moles of O2 produced using the mole ratio from the balanced equation:

Moles of O2 = (0.1 moles of KClO3) * (3 moles of O2 / 2 moles of KClO3) = 0.15 moles