CHEMISTRY COLLEGE

How many grams of phosphorus are in a sample of Ca3(PO4)2 that contains 50.0 g of calcium? Answer: ________ grams of phosphorus.

Answers

Answer 1
Answer:

Answer: The mass of phosphorus that is present for given amount of calcium is 28.53 g.

Explanation:

We are given:

Mass of calcium = 50 grams

The chemical formula of calcium phosphate is

Molar mass of calcium = 40 g/mol

Molar mass of phosphorus = 31 g/mol

In 1 mole of calcium phosphate, 120 grams of calcium is combining with 62 grams of phosphorus.

So, 50 grams of calcium will combine with = of phosphorus.

Hence, the mass of phosphorus that is present for given amount of calcium is 28.53 g.


Related Questions

MIDDLE SCHOOL

Give an example of homeostasis in your body

Answers

Answer:

So, basically Homeostasis is regulation and the. one seen almost every day is shivering or sweating. Our body's normal temperature is approximately 37° C and if you drop below that your body will regulate that by shivering or if you go above it you'll start to sweat to cool off you body and decrease your body temperature back to "equilibrium" or normal temp.
HIGH SCHOOL

The oxygen saturation of a lake is found by dividing the amount of dissolved oxygen the lake water currently hasper liter by the dissolved oxygen capacity per liter of the water, and then converting that number into a percent. If the lake currently has 7.4 milligrams of dissolved oxygen per liter of water and the dissolved oxygen capacityis 9.4 milligrams per liter, what is the oxygen saturation level of the lake, to the nearest percent? Please help me with this one ;(

Answers

MIDDLE SCHOOL

Which DSS principle determines solutions or alternate actions in precision farming

Answers

Answer:

Precision agriculture is based on measuring and examining the variability of crops to grow more food with fewer resources and lower the costs; the Decision Support System for precision farming uses the principle of "Quick information transfer" among researchers and farmers to ensure the agricultural development.

Explanation:

When multiple data streams are collected, one must decide how those data will be fused in the decision process. Separate data streams can be:

Mixed mode (including both quantitative and qualitative data).
Redundant (validating the data from another stream).
Complementary (providing measures of multiple characteristics of an object).
Supportive (helping verify some interpretation of another data stream).
HIGH SCHOOL

All of the following are true about science except It is a body of knowledge.

It does not change once a law is discovered.

It is tested by many scientists over time.

It uses the scientific method.

Answers

The facts about Science are: it is a body of knowledge, tested by many scientists overtime, and it uses the scientific method. The only statement that is false about Science is: it does not change once a law is discovered.

The answer is letter the second statement.

The statement, which is not true about science is this: IT DOES NOT CHANGE ONCE A LAW IS DISCOVERED.

Science is a very dynamic subjects, which involves carrying out a lot of scientific investigations and investigations are always ongoing all the time. When a scientific investigation obtained results that are contrary to existing knowledge, scientists usually carry out the investigation repeatedly to ensure that constant results will be obtained. Once the new discovery is confirmed to be true, the existing knowledge will be updated based on the new discovery.

HIGH SCHOOL

Fluid in the semicircular canals stimulates impulses to the brain to maintain balance t or f

Answers

The answer is True.  Fluid in the semicircular canals stimulates impulses to the brain to maintain balance.  If the semicircular canals are damaged, the balance sense will be affected.  
COLLEGE

Determine the overall charge on each complex.a) tetrachlorocuprate(i)b) pentaamminechlorocobalt(iii)c) diaquadichloroethylenediaminecobalt(iii)

Answers

Complex a: tetrachlorocuprate(i)
In present complex chlorine is negatively charged ligand (-1) and oxidation state of copper is +1. Therefore, total charge on complex = 4(-1) + 1 = -3

Complex b: pentaamminechlorocobalt(iii)
In present complex, ammine is a neutral ligand (charge = 0), chlorine is negatively charged ligand (charge = -1) and oxidation state of Co is +3. Therefore, total charge on complex is 5(0) + (-1) + (+3) = +2

Complex c: diaquadichloroethylenediaminecobalt(iii)
In present complex, aqua is a neutral ligand (charge = 0), chlorine is a negatively charged ligand (charge = -1), ethylenediamine is a neutral ligand (charge = 0) and oxidation state of cobalt is +3. Therefore, total charge on complex is 2(0) + 2(-1) + 2(0) + 3 = +1. 
MIDDLE SCHOOL

How is bacteria, a rose, and an elephant alike?

Answers

they both are are made of cells or one cell

COLLEGE

Which equation correctly represents the first electron affinity (ea1) of calcium?

Answers

Answer :

The correct answer is :

Electron Affinity :

It is defined as energy released  or absorbed when an electrons is added to neutral isolated atom in gaseous state .

The first electron affinity is the energy absorbed or released when one electron is to  outermost  shell of a neutral atom .

The first electron affinity  is generally negative , when electron is added to non metals .  While when electron  is added to metals , the electron affinity is positive.

More the negative electron affinity , more the atom has tendency to accept the electron .

For example :  F(g) + e⁻  → F⁻(g)   ΔH⁰ = - 328.0

- 328.0  represents  first electron affinity of Fluorine atom .

First electron affinity for Calcium can be written as :

The symbol for Calcium in its ground state is Ca . Since the electron (e⁻) is added so it is written on left  side or reaction . The calcium will accept the electron and will form a negative ion as Ca⁻ .

Hence the equation goes as


Answer : The correct equation will be:

Explanation :

Electron affinity : It is defined as the addition of electron to the atom or to the ion. The atom or ion is always in gaseous phase.

In other words we can say that, the gaining of electrons is said to be an electron affinity.

As, the given element is a calcium metal, so it will gain an electron to form a anionic atom.

The balanced and correct equation for first electron affinity of the calcium will be:

HIGH SCHOOL

Match the following items. 1 . gas low energy 2 . solid matter is continuously in motion 3 . Kinetic Molecular Theory rapid, random motion 4 . Boyle's Law relates pressure and volume 5 . Charles's Law relates volume and temperature

Answers

Explanation:

  • As molecules in a solid substance are placed closer to each other because of existence of strong forces of attraction. So, these molecules are unable to move randomly but they are able to vibrate at their mean position.

Hence, molecules of a solid have low energy.

  • In gases, molecules are held by weak intermolecular forces. So, they are able to move randomly from one place to another. Hence, they have high kinetic energy.
  • According to Kinetic Molecular Theory, molecules of a gas are always in constant motion and they tend to exhibit a perfect elastic collision.

This means that in kinetic molecular theory molecules of a gas are in rapid, random motion.

  • Boyle's Law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

                      (at constant temperature and number of moles)

  • Charles' Law states that volume is directly proportional to the temperature of the gas at constant pressure and number of moles.  

                      (at constant pressure and number of moles)

Thus, we can conclude that the given items are matched as follows.

1.  gas - continuously in motion.

2. solid matter - low energy.

3. Kinetic Molecular Theory - rapid, random motion.

4. Boyle's Law - relates pressure and volume.

5. Charles's Law - relates volume and temperature.

Answer:

1.  gas - continuously in motion.

2. solid matter - low energy.

3. Kinetic Molecular Theory - rapid, random motion.

4. Boyle's Law - relates pressure and volume.

5. Charles's Law - relates volume and temperature.

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