# Posts by malina

Total # Posts: 9

**chemistry**

A Li2+ ion had its electron in an excited state. When the electron relaxed to the ground state (n = 1) a photon of light was emitted with an energy of 1.884×10−17 J. What energy level was the electron in before it transitioned to the ground state?

**Chem**

1) Mg + F2 = MgF2 10.00 grams of magnesium reacted with fluorine to produce MgF2 Find : a) Balance the reaction b) How many grams of fluorine reacted with magnesium. Answer:____________ c) How many grams of MgF2 were formed in the reaction. Answer:____________

**Chemistry**

10.0 grams of magnesium reacted with fluorine to produce MgF2 Find balance equation: 2MgF2=2MgF 1)can someone explain to me how many grams of fluorine reacted with magnesium. 2)How many grams of MgF2 were formed in the reaction?

**Chemistry**

What volume a sample of 67.0 grams of nitrogen gas (N2)will occupy at -25degrees C and 3 atm pressure?

**Chemistry**

Al+S=Al2S3 Balanced equ= 2Al+3S=Al2S3 10 grams of Al were mixed with 15 gram of S Find: limiting reagent al or s? How much Al2S3 were formed in reaction? What is the excess reagent?Al or S? How much excuss reagent left over after reactin? Thanks! <3

**algebra**

Sophie bought 23 cans of cat food for x dollars. Write an expression to show the cost of one can of cat food

**algebra**

Wally collects 15 baseball cards each week. He gave 10 cards to his friend james. write an expression to show the number of cards that wally has left

**algebra**

Janet bought 5 shirts for s dollars each and 3 pairs of shoes for p dollars each. Write an expression to show the total that janet spent on the shoes and shirt

**math**

can you explain roman numerals to me? http://www.quia.com/jg/66123.html omg u fikooo