Determime the number of moles in the following compounds; a. 125 g of H2SO4 b. 35 g of CuSO4 × 5H2O

Answers

Answer 1

Answer: Mr of H2SO4 = 2+32+64= 98g No. Of moles = 125/98= 1.28 moles. B) Mr of CuSO4 = 64+32+64=160 Mr of 5H2O = 18x5=90 CuSO4.5H2O = 160+ 90 = 250g No. Of moles = 35/250= 0.14 moles

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If it takes 54ml of 0.1 m naoh to neutralize 125 ml of a hcl solution with unknown concentration, what is the concentration of the hcl?
Which of these statements best explains why the soil around a volcanic region is fertile? Select one: a. Volcanoes always contribute to flooding, which enriches the soil. b. Volcanoes aid in the formation of new rocks, which help form fertile soil. c. Particles released in the air by volcanoes fall to the ground and enrich the soil.
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
What element has 25 protons?

Alcohol contains __________
a. ethanol.
b. gasoline.
c. opiates.

Answers

Answer:

Alcohol contains A. ethanol.

Explanation:

Alcohol beverages are drinks that contain more than a minimal amount of ethyl alcohol or ethanol. Ethanol is a chemical compound, considered the main type of alcohol. It is produced by grain fermentation and used as a solvent, as an additive to gasoline and as the intoxicating ingredient of beer, wine, distilled spirits and other beverages.

the answer is A. Ethanol. Ethanol is an active principal in alcoholic beverages

The study of metals and the process for refining and making things from them is called _____. philosophy
18
metallurgy
inductive reasoning

Answers

The study of metals and the process for refining and making things from them is called metallurgy.Metallurgy is said to be the scientific study both of the extraction and refining process of metals from their ores.This process includes steps such as grinding of the ore also called ore pulverization.Ore is crushed to increase its surface area for purpose of increasing the level of its reactivity.Sometimes, the ore is heated in the presence of oxygen to turn the ore into and oxide. This process is known as roasting.

the answer would be:

C. metallurgy

WORTH 40 POINTSOK so I’m doing a science fair project and I need a title for it. The project is on amount of protein in milk. The question is what type of cows milk has the highest amount of protein.

(Also I asked once before, someone just said MOO! can you add onto that for the title?)

Answers

Answer:

muscle milk or milk is muscle

Explanation:

Answer:

the protein in cows milk

The only way to emit IR photons is if there are empty electronic energy levels really close to the ground state (lowest energy level). True or False

Answers

Answer:

False. The statement is not entirely accurate.

Explanation:

Infrared (IR) photons can be emitted in various ways, not solely dependent on the presence of empty electronic energy levels close to the ground state. IR photons are typically associated with changes in molecular vibrational or rotational energy levels rather than electronic energy levels.

IR spectroscopy, for example, focuses on the interaction of IR radiation with molecules. When molecules undergo vibrational or rotational transitions, they can emit or absorb IR photons. These transitions are related to changes in the kinetic and potential energy of atoms within the molecule as they vibrate or rotate.

Electronic transitions, on the other hand, are responsible for phenomena like ultraviolet (UV) or visible light absorption and emission. In these cases, electrons move between electronic energy levels, which are typically at higher energy levels than the ground state. So, the emission of IR photons is not directly tied to electronic energy levels close to the ground state.

In summary, IR photon emission is primarily associated with vibrational and rotational transitions in molecules, and it is not contingent on the presence of empty electronic energy levels close to the ground state.

____ Turns food into a new form: a form that cells can use. A chemical change. B grinding. C physical change. D mixing. Why

Answers

The correct answer is A. Chemical change turns food into a new form, a form that cells can use. It happens because the food we eat cannot be processed by cells so several reactions inside our body allow chemical changes to the food we ate turning them to usable compounds for our cells.

A solution has a volume of 250 ml and contains 0.70 mol Nacl what is the molarity

Answers

first convert mL into liters:

1 L = 1000 mL

250 mL / 1000 = 0.25 L

M = n / V

M = 0.70 / 0.25

M = 2.8 mol/L⁻¹

hope this helps!

The correct answer is D, 2.8 M.

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1.34 milligrams is the same as _____ kg and _____g. here are some answers you can pick from for Kg the choices below are the same for G A. 13.4 B. 0.0134 C. 0.00000134

In the metric system, which of the following is correct?1,000 liters = 1 milliliter1,000 kilograms = 1 gram100 centimeters = 1 meter

A solution is made by dissolving 54.0 g of silver nitrate in enough water to make 350.0 ml. A 10.00 ml portion of this solution is then diluted to a final volume of 250.0 ml. What is the total concentration of ions present in the final solution?