carboxyclasses

Boron has an average atomic mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percent. The other isotope has a relative abundance of 80.20 percent?

What is the mass of the isotope? Report to two decimal places.

Write balanced equations for the complete combustion of each of the following substances. (Use the lowest possible in your answer.)

(a)    

(b)  

(c)  

How many grams of sodium bicarbonate (w/v)is needed to mixed with 500ml of water  to make a 15% solution.specific gravity of water is 1 .

List or draw two ways to visually represent C6H14

list or draw two ways to visually represent c6h14

What are the two ways you can visually represent c6h14? List or draw them

Ozone (OR) in the atmosphere can react with nitric oxide (NO) 

O2(g)+NO(g)- NO2(g)+O2(g)

Calculate the G for this reaction at 25C

(H=-199kJ/mol, S=-4.1 J/K.mol)

A flask of mercury contains . How many moles of mercury are in the flask?

a big bag of m&ms contains 1175 g of m&ms how many are in the bag show your work

1. Sketch the followings Miller indices within a cubic unit cell: (021) [333]؟

3. A big bag of M&Ms.

How many M&Ms are in the bag? _______ Show your work!

1. Explain the difference between an exothermic and an endothermic reaction. Give the sign of ΔH for each type of reaction.

Why peaks in the UV-visible spectra are broad while in NMR spectra, sharp peaks are observed?