CHEMISTRY HIGH SCHOOL

How many moles are equal to 89.23g of calcium oxide?

Answers

Answer 1

Answer:

mass of calcium oxide equals 89.23 g

molar mass of calcium oxide equals 56 G / Mole

the formula which is used as much of CaO equals molar mass of CaO

now put all of the Given values in this formula, we would get the moles of calcium oxide.

moles of CaO= 88.23g over 56g/mole which would get you 1.593 moles

Related Questions

Are these answers correct?1. A gas occupies 30 L at 760 mm Hg. What is its volume at 350 mm Hg? P1*V1 = P2*V2 760 mm Hg *30 L = 350 mm Hg * V2V2 = 22800 mm Hg*L/350 mm HgV2 = about 65.14 L2. A gas occupies 500 mL at 1 atm. What is its pressure if the volume becomes 1500 mL?P1*V1 = P2*V21 atm*500 mL = P2*1500 mL500 atm*mL/1500 mL = P2P2 = 1/3 atm3. If a gas occupies 250 mL at 25°C, what will its volume be at 57°C? 25°C + 273 = 298°K; 57°C + 273 = 330°KV1/T1 = V2/T2250 mL/298°K = V2/330°K0.84 mL/k*330°K = V2V2 = about 276.85 mL4. What was the original temperature of a 2 L sample of gas if it initially had the volume 5 L at 27°C? 27°C + 273 = 298°KV1/T1 = V2/T25 L/298°K = 2 L/T22 L/(0.017 L/K)= T2T2 = 119.2°K = -153.8°C 5. At what pressure would 100 mL of a gas be found if it began at 500 mL at 2.5 atm?P1*V1 = P2*V2 2.5 atm*500 mL = P2*100 mL125 atm*mL/100 mL = P2P2 = 1.25 atm6. What is the volume of a gas at 275 mm Hg if it occupied 750 mL at 1000 mm Hg?P1*V1 = P2*V21000 mm Hg*750 mL = 275 mm Hg*V2750000 mm Hg*mL/275 mm Hg = V2V2 = about 2727. 27 mL7. A gas occupies 60 L at 250°K and 1 atm. What is its volume at 250°C and 1.5 atm?250°C + 273 = 523°KP1*V1/T1 = P2*V2/T21 atm*60 L/250°K = 1.5 atm*V2/523°K0.24 (atm*L/K)*523°K = 1.5 atm*V2125.52 (atm*L)/1.5 atm = V2V2 = 83.68 L8. What is the final temperature in Celsius of a gas occupying 3.25 L at 750 mm Hg if it occupied 2250 mL at 37°C and 600 mm Hg? 37°C + 273 = 310°K; 2250 mL = 2.25 LP1*V1/T1 = P2*V2/T2600 mm Hg*2.25 L/310°K = 750 mm Hg*3.25 L/T22437.35 mm Hg*L/ (4.35 mm Hg*L/K) = T2T2 = 559.69°KT2 = about 286.69°C
Which of the following would not necessarily indicate a chemical reaction?change in temperaturechemical precipitation of a solidproduction of a gaschange in volume
A chemical reaction in which compounds break up into simpler constituents is a _______ reaction.a. combinationb. decompositionc. double replacementd. substitution
6. Explain why the boiling point of water is a characteristic physical property, but the temperature and volume of a glass of water are not.
Express the answer in scientific notation and with the correct number of significant figures: (6.32 x 10-4) ÷ 12.64Your answer should have the same number of significant figures as the starting measurement. 872.4 mm =

During nuclear fission, great amounts of energy are produced froma. very small amounts of mass.
b. tremendous amounts of mass.
c. a series of chemical reactions.
d. particle accelerators.

Answers

The answer should be A. It takes a very small amount of mass to produce a lot of energy which is displayed in Einstein's equation E=mc². E is the amount of energy given off when some mass is converted into energy.
E=the energy given off, m=the mass turned to energy (I think this is sometimes referred to as the mass defect), and c=the speed of light. Nuclear reactions do not fallow the law of conservation of mass since some of the mass is converted into energy.

I hope this helps. Let me know if anything is unclear.

Final answer:

In nuclear fission, great amounts of energy are produced from very small amounts of mass, as described by Einstein's mass-energy equivalence principle E=mc². The energy is derived from the conversion of a small amount of nuclear mass.

Explanation:

During the process of nuclear fission, large amounts of energy are actually released from very small amounts of mass. This is in accordance with Einstein's mass-energy equivalence principle expressed in his famous equation E=mc², where E represents energy, m is the mass, and c² is the speed of light squared. This equation depicts that even small amounts of mass can produce tremendous energy when speed of light is raised to power of two which is a very large number. Therefore, the correct answer to your question is Option A: very small amounts of mass.

Learn more about Nuclear Fission here:

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What kind of glass is the following Si, O, Na, B, Al no plastic, no visible change, will shatters to high impact? 1. Pyrex Glass 2. Laminated soda-lime glass, 3. Ordinary Soda-Lime Glass, 4. Heat-tempered soda-lime glass?

Answers

The kind of glass that is Si, O, Na, B, Al no plastic, no visible change, that will shatter to high impact is 1. Pyrex glass.

Answer:

Explanation:

A vineyard has 145 acres of Chardonnay grapes. A particular soil supplement requires 5.50 g for every square meter of vineyard. How many kilograms of the soil supplement are required for the entire vineyard? (Recall that 1 km2 = 247 acres.) Express your answer in kilograms to three significant figures.

Answers

1.36.10 ^ 6 kg of supplements are required for the entire vineyard

Further explanation

7 main quantities have been determined based on international standards, namely:

1. Length, meters (m)

2. Time, second (s)

3. Mass, kilograms (kg)

4. Temperature, kelvin (K)

5. Light intensity, candela (cd)

6. Electric current, ampere (A)

7. Amount of substance, mol (m)

Derivative magnitude is a quantity derived from one or more principal quantities. So in addition to 7 principal quantities, other quantities are derived quantities

An area with the formula length x width is a unit derived from the length of the principal. The international standard unit is square meters (m²).

other area units: Km², hm², dam², m², dm², cm², and mm²

Hectare is an SI unit

1 Hectare is equal to 100 a (Are) or 10000 m² (ten thousand square meters) or 100 x 100 m 1 Hectares = 2.47 acres

In the question , there is a 145 acres vineyard, with the supplement is given 5.5 gram / m² vineyard.

So for 1 km², a supplement =

1 km² = 10⁶ m²

5.5 gram / m² = 5.5.10⁶ grams / km²

whereas 1 km² = 247 acres and vineyard = 145 acres so

$5.5.10^6*(145)/(247)$

= 3.2287.10⁶ grams

= 3.23.10³ kg (3 significant numbers: 3,2 and 3)

Learn more

Convert the following metric units of weight

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conversion factor

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convert a mass of 2.93 pounds to ounces

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Keywords: area, convert, acres

The soil supplement required for the entire vineyard is $\boxed{3.23 * {{10}^3}{\text{ kg}}}$ .

Further Explanation:

There are two types of units. One is basic or fundamental while the other ones are derived units. Basic units cannot be further reduced and other quantities are expressed in these units. Derived units are those that can need basic units to express themselves. Area, density, volume and velocity are some examples of derived units.

Seven basic units are present in the SI system. These are as follows:

1. Meter (m)

2. Kilogram (kg)

3. Second (s)

4. Kelvin (K)

5. Ampere (A)

6. Mole (mol)

7. Candela (Cd)

Firstly, the area of vineyard has to be converted into ${\text{K}}{{\text{m}}^2}$ . The conversion factor for this is,

$1{\text{ acre}} = \left( {\frac{1}{{247}}} \right){\text{ K}}{{\text{m}}^2}$

Therefore the area of vineyard can be calculated as follows:

$\begin{aligned}{\text{Area of vineyard}} &= \left( {145{\text{ acres}}} \right)\left( {\frac{{1/247{\text{ K}}{{\text{m}}^2}}}{{1{\text{ acre}}}}} \right)\n&= 0.587045{\text{ K}}{{\text{m}}^2}\n\end{aligned}$

The area is again converted into ${{\text{m}}^{\text{2}}}$ . The conversion factor for this is,

$1{\text{ K}}{{\text{m}}^2} = {10^6}{\text{ }}{{\text{m}}^2}$

So the area of vineyard can be calculated as follows:

$\begin{aligned}{\text{Area of vineyard}}&= \left( {0.587045{\text{ K}}{{\text{m}}^2}}\right)\left( {\frac{{{{10}^6}{\text{ }}{{\text{m}}^2}}}{{1{\text{ K}}{{\text{m}}^2}}}}\right)\n&= 587045{\text{ }}{{\text{m}}^2}\n\end{aligned}$

The amount of supplement required for the entire vineyard can be calculated as follows:

$\begin{aligned}{\text{Amount of supplement required}}&= \left( {587045{\text{ }}{{\text{m}}^2}} \right)\left( {\frac{{5.50{\text{ g}}}}{{1{\text{ }}{{\text{m}}^2}}}} \right)\n&=3.2287475 * {10^6}{\text{ g}}\n\end{aligned}$

The amount of supplement is to be converted into kg. The conversion factor for this is,

$1{\text{ g}} = {\text{1}}{{\text{0}}^( - 3)}{\text{ kg}}$

Therefore the amount of supplement can be calculated as follows:

$\begin{aligned}{\text{Amount of supplement}}&= \left({3.2287475 * {{10}^6}{\text{ g}}} \right)\left( {\frac{{{{10}^( - 3)}{\text{ kg}}}}{{1{\text{ g}}}}} \right)\n&= 3.2287475 * {10^3}{\text{ kg}}\n&\approx 3.23 * {10^3}{\text{ kg}}\n\end{aligned}$

Learn more:

What is the mass of 1 mole of viruses: brainly.com/question/8353774
Determine the moles of water produced: brainly.com/question/1405182

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Basic concepts of chemistry

Keywords: supplement, vineyard, 5.50 g, 3.23*10^3 kg, conversion factor, basic units, fundamental units, derived units, area, volume, density, kg, m, Km, acre.

An atom has 11 protons, 12 neutrons, and 11 electrons. what is the charge of the atoms nucleus?A) +11
B) -11
C) 0
D) 23

Answers

Answer:

Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.

Explanation:

Explain what happens to a fixed sample of gas when its temperature changes.

Answers

The Ideal gas law: pV=nRT

n=const.
R=const.

V~T, it means If temperature increase than volume of gas increase.
if temperature decrease than volume of gas decrease.

The stability of an isotope is based on its(1) number of neutrons, only
(2) number of protons, only
(3) ratio of neutrons to protons
(4) ratio of electrons to protons

Answers

Option 4. ratio of electrons to protons

Isotope that has atomic number of 82 is stable. An element that has an atomic number ∠82 more stable except Tc and Pm. Also there is the concept that isotopes consisting a combination of even-even,even-odd,odd-even, and odd-odd are all stable. Many isotopes with no magic numbers of nucleons are stable

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An aluminum sample has a mass of 80.1 g and a density of 2.70g/cm3 . According to the date to what number of significant figures should the calculate volume of the aluminum sample be expressed?

Which question would most likely be studied by a physicist?A. Were there ever any living organisms on Mars? B. How can the forces on a space probe be controlled so it will land on Mars? O C. What type of substances make up the soil on Mars? O D. Should the government spend taxpayers' money to send space probes to Mars?