01/19/21

chemistry 2 question 3

how many moles of ethylene glycol (C2H6O2) should be added to 25.0 moles of water to make a solution with a vapor pressure of 17.5 torr? the vapor pressure of pure water is 23.8 torr. you can... more

01/19/21

How many grams of Li3N are produced when 25 grams of N2 react with excess Li?

Balanced form: 6 Li + N2 = 2 Li3N

01/17/21

Chemistry gas laws

A sample of potassium chlorate placed in a 20.0-L container decomposes to form potassium chloride and oxygen gas.2KClO3(s) → 2KCl(s) + 3O2(g)If the sample contained 2.0 moles of KClO3 at a... more

01/15/21

4.2 moles of KOH equals how much mass

In this experiment is it necessary to decompose all of the KClO₃? Why or why not?

I really need help with this Ideal gas law lab

01/12/21

I'm new to chemistry and I need help with this

A chemist starts with a 50.0 mL sample of 0.265 M propanoic acid, HC3H5O2, then adds 0.496 g of sodium propanoate, NaC3H5O2.1.Explain how this creates an effective buffer.2.Propanoic acid has an... more

01/12/21

I'm new to chemistry and I need help with this

A chemist starts with a 50.0 mL sample of 0.265 M propanoic acid, HC3H5O2, then adds 0.496 g of sodium propanoate, NaC3H5O2.1.Explain how this creates an effective buffer.2.Propanoic acid has an... more

01/12/21

Acid based chemistry problems

A chemist has a solution of 0.010 M NaOH.1.Write the equation for the dissociation of sodium hydroxide in water.2.Calculate the pOH, the pH and concentration of hydrogen ions in the... more

01/11/21

Ideal gas law combined gas law

A gas sample at 40.0C has a volume of 62.0 L when under a pressure of 0.82 atm. What is the new volume if the pressure is increased to 2.02 atm. and the temperature decreases to 10.0C? (Kelvin... more

Chemistry Please Help!

Liquid nitroglycerine (C3H5(NO3)3) is a powerful explosive. When it detonates, it produces a gaseous mixture of nitrogen, water, carbon dioxide, and oxygen. a) What is the theoretical yield of... more

Chemistry, PLEASE HELP ASAP! Acetylene gas, also known as ethyne, is used in welding and for many other industrial applications

Acetylene gas, also known as ethyne, is used in welding and for many other industrial applicationsa) if 13.7g of ethyne, C2H2 reacts with 18.5g O2 producing carbon dioxide and water vapor, what is... more

01/11/21

Empirical Formula

A 1.56g sample of copper reacts with oxygen to form 1.95g of the metal oxide. What are the answers to step 1 (to 3 sig figs)?mol O =  mol Cu =  

01/11/21

Find the empirical formula of a compound that contains 68.4% chromium and 31.6% oxygen.

Please help. I cried over this twice and I just don't understand. Thank you in advance.

Rank each of the below molecules' melting point and boiling point from scale of 1 (lowest) to 7 (highest) and explain why:

Rank each of the below molecules' melting point and boiling point from scale of 1 (lowest) to 7 (highest) and explain why:a) HCIb) H2c) H2Od) NH3e) CCI4f) CO2e) HBr

01/11/21

Electrolysis of Aqueous nickel fluoride

In an electrolytic cell containing a solution of Nickel (II) fluoride, what would be the anode and cathode reactions that take place? Here is what I came up with:Anode: The fluoride will get... more

01/10/21

Hydrogen peroxide, H^2 O^2, decomposes at room temperature to release oxygen gas.

Use the law of definite proportions to explain why doubling the quantity of hydrogen peroxide doubles the quantity of oxygen produced.

12/13/20

How much liquid will be present?

The vapor pressure of ethanol, CH3CH2OH, at 30.0 C is 10.46 kPa . If 2.22g of ethanol is enclosed in a 2.00 L container, how much liquid will be present?

11/19/20

A chemistry problem

The heating curve of substance X is shown below. The molar mass of substance X is 48.5 g/mol.Use the following data to calculate the total heat needed to increase the temperature of 20.0 g of... more

11/19/20

i need help on this question

The figure is a 3-dimensional representation of an atomic orbital. Which orbital does it represent? three d-orbital a single p-orbital three p-orbitals an s-orbital

Which of the following is most likely to be a gas at room temperature? A) K₂S B) C₈H₁₈ C) MgF₂ D) F₂ E) H₂O

I am fairly certain its F2, but an explanation would be appreciated!!!

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