CHEMISTRY HIGH SCHOOL

how many grams of ca(po4)2 would be produced when 1.5 grams of (nh4)3po4 is reacted with an excess of ca(oh)2

Answers

Answer 1
Answer: Molar mass :

(NH₄)₃PO₄ = 149.0 g/mol

Ca₃(PO₄)₂ = 310.17 g/mol

2 (NH₄)₃PO4 + 3 Ca(OH)₂= Ca₃(PO₄)₂ + 6 NH₄OH

2 * 149 g --------- 310.17 g
1.5 g -------------- ?

mass = 1.5 * 310.17 / 2 * 149

mass = 465.255 / 298

= 1.561 g of Ca₃(PO₄)₂

hope this helps!

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A solution that has a relatively large quantity of solute dissolved in the solvent is:? and please explain the answerA) heterogeneous
B) dilute
C) dissociated
D) Concentrated

Answers

A solution that has a relatively large quantity of solute dissolved in the solvent is concentrated.

What is solute?

  • The substance that is dissolved in a solution is known as a solute.
  • The solvent is present in higher amounts than the solute in fluid solutions.
  • Concentration is the ratio of the amount of solute in a chemical solution to the amount of solvent present.

What is solvent?

  • The component of a solution that is present in the largest amount is called a solvent.
  • It's the liquid that the solute is dissolved in.
  • A solvent is usually a liquid. It can however, be a gas, a solid or a supercritical fluid.

Hence, option D is the answer.

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A solution that has a high amount of solute/concentration in the solvent is concentrated because if there is a lot of solute compared to the solvent, then the ratio of solute to solvent is higher, and thus the concentration is higher too.
Hope this helps!

Why graphite can rub off the pencil onto the paper

Answers

Graphite is an extremely soft material and is formed in layers as well.This combination of traits allows for the graphite to scrape off of the pencil tip and onto the paper.

SI units are useful because they are all related by multiples of ____.

Answers

Answer:

SI units are useful because they are all related by multiples of 10.

Explanation:

International System of Units (abbreviated SI) is a system of measurement units, which is used almost everywhere in the world.

A unit system is a set of units of consistent, standard and uniform measurement. In other words, a unit system is a set of units (grouped and formally defined) that is used as a standard. Normally, in a system of units, few basic units are defined and from these several derived units are defined.

The International System of Units defines seven basic units, also called fundamental units, which define the corresponding fundamental physical quantities, chosen by convention, and which allow to express any physical quantity in terms or as a combination of them. The other units are obtained by combining the basic units.

The basic units of this system are:

  • Length-meter (m)
  • Mass-kilogram (kg)
  • Time- second (s)
  • Electric current intensity - ampere (A)
  • Temperature - Kelvin (K)
  • Amount of substance - mol (mol)
  • Light intensity - candela (cd)

The SI is based on the metric system, which is a system of units that are related to each other by multiples or submultiples of 10.

Then, SI units are useful because they are all related by multiples of 10.
SI units are useful as they are all related by multiples of 10.

What are the products of the complete combustion of a hydrocarbon in excess oxygen

Answers

The products for the complete combustion of a hydrocarbon in excess air is carbon dioxide and water. Any hydrocarbon when reacted with oxygen will always yield the said products. Incomplete combustion, on the other hand, yields carbon monoxide and water.

How do electrons populate atoms?

Answers

Electrons fill the electron orbitals (s, p, d, or f) starting from the lowest energy level going to the highest energy level. I hope this helps. let me know if you need more information such as what the

NaHCO3 (s) + HC2H3O2 (aq) = NaC2H3O2 (aq) + H2O (I) + CO2 (g)Using the above formula, if I used 0.100L of 0.83 M HC2H3O2 (aq) (0.83 mol per 1 L of solution), how much carbon dioxide would be produced?

Answers


Moles=volume*concentration   
         =0.1*.83
         =.083 Moles of HC2H3O2
Mole ratio between HC2H3O2 and CO2 is 1:1
This means .083 Moles of CO2

Mass =Moles*Rfm of CO2
         =.083*(12+16+16)
         =3.7grams

Final answer:

By utilizing stoichiometry, we can determine that the given volume and molarity of acetic acid (HC2H3O2) would produce approximately 3.65 grams of carbon dioxide (CO2). The calculation involves determining the moles of HC2H3O2 used, which equals the moles of CO2 produced, and converting that to grams using the molar mass of CO2.

Explanation:

The amount of carbon dioxide produced can be determined through stoichiometry, using the provided balanced chemical equation and molarity (M) of the acetic acid HC2H3O2. According to the balanced chemical equation, one mole of NaHCO3 reacts with one mole of HC2H3O2 to produce one mole of CO2. In other words, the moles of HC2H3O2 used equals the moles of CO2 produced.

First, calculate the moles of HC2H3O2 by multiplying the given volume (0.100 L) by its molarity (0.83 mol/L): 0.100L x 0.83 mol/L = 0.083 mol.

So, according to the stoichiometric ratio, 0.083 mol of HC2H3O2 would produce 0.083 mol of CO2. If you want your answer in grams, note that the molar mass of CO2 is approximately 44.01 g/mol. Multiply the moles of CO2 by its molar mass: 0.083 mol x 44.01 g/mol = 3.65g.

So, the amount of CO2 produced would be 3.65 grams.

Learn more about Chemical Stoichiometry here:

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