200 grams of an organic sample which contains only carbon, hydrogen and oxygen is analyzed and found to contain 97.30grams of carbon, 16.22grams of hydrogen and the remainder oxygen. what is the empirical formula for the compound?

When finding the mass number of an element do you round the atomic mass up or down? Ex. atomic mass of 74.9216, is the mass number 75 or 74

2. When iron reacts with oxygen, it forms iron oxide, or rust. 4 Fe + 3 O2 2 Fe2O3 If 112 g of iron (Fe) combines with 24 g of oxygen (O2), how much iron oxide is formed?

You are driving west on highway 510 in a European car. The speed limit for this portion of the highway is 50 miles per hour. Your speedometer reads 120 km/hr. Are you speeding or not? How fast are you traveling in mph? (1 km = 0.621 miles)

In a nuclear experiment a proton with kinetic energy 1.0 MeV moves in a circular path in a uniform magnetic field. What energy must ( a. an alpha particle (q = + 2e, m = 4.0 u) and ( b. a deuteron (q = + e, m = 2.

Elvin is asked to analyze a 0.353 gram sample of metal. He measures the amount of heat released by cooling it from 50.0 °C to 22.0 °C as 2.28 J. What is the specific heat of this metal? What metal could this be?

How many particles are in 1 mole of a substance?

Initially you dissolved all, or most, of the p-aminobenzoic acid in ethanol. then you slowly added sulfuric acid. as you did this, a large amount of white solid formed. during the course of the reaction, that white solid dissolved.

How do you know if a chemical reaction has occurred?

Why must a container or system be closed for equilibrium to be established?

What is the bond angle between the hydrogen atoms in an ammonia (NH₃) molecule?