Magnesium combines with oxygen to form magnesium oxide. If 24.46 g of magnesium reacts completely with 5.41 g of oxygen, what is the percent by mass of oxygen in magnesium oxide?

How much energy would be required to vaporize 45.0 grams of water?

At what temperature will 55 g of Pb (NO3) 2 dissolve?

What is the pressure exerted by 3.00 mol of ar gas with a volume of 50.0 l at 25.0ºc (298.2 k) ?

Calculate the energy required to produce 9.00 mol of Cl₂O₇ based on the following balanced equation. 2Cl₂ (g) + 7O₂ (g) + 130 kcal → 2Cl₂O₇ For 2 mol you need 130 kcal, so how much would you need for 9.00 mol? 9.00 kcal 65 kcal 585 kcal 1,170 kcal

What happens to the volume of a sugar solution as more sugar is dissolved in it?

What was the result of the atomic theory?

Explain mitosis and meiosis in your own words.

What device changes mechanical energy into electrical energy? Question 4 options: transformer generator copper wire light switch

Reaction rates are affected by how often the particles collide true false

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.