# Gas Volume Stoichiometry Problem

Given Problem: Methanol (CH3OH) can be synthesized as: CO+2H2→CH3OH. What volume in liters of H2(g) is needed to make 35.7 grams of CH3OH?  1. We are given the temperature at 355 K and the pressure is 738 mmHg. 2.  First, you must convert the target mass of CH3OH to moles. To do this, you use the molar mass … Continue reading Gas Volume Stoichiometry Problem

# Finding Wavelength of Light (nm) Using Frequency (Hz)

The point of this problem is to be able to use the c=λν to find the wavelength of light. This problem could also be structured to find the frequency of the light using just the wavelength. 1. The equation we're working with has two values already entered in it. The speed of light (3.00*10^8 m/s) … Continue reading Finding Wavelength of Light (nm) Using Frequency (Hz)

# Percent Mass Composition Example

The point of these problems is to calculate the mass of a specific element in a given compound. We're given 88.07 grams of C4H8S, and the molar mass of sulfur is 32.07 grams/mol. We know that the % mass composition is found by dividing the molar mass of our target element by the total mass … Continue reading Percent Mass Composition Example

# Episode 2: Atoms and Elements

Video Content: -Atomic Theory -Atomic Structure -Ions vs. Isotopes -Example Problem Published November 13th, 2016 Thank you for using Heychemistry.com! Have any feedback? Reach us via our contact page! Video troubles? Try the YouTube link.

# Episode 1: Introduction to Chemistry

Video play troubles? Here's the YouTube link.  Content: Introduction, unit conversions, significant figures, scientific notation & example problems. Corrections: Miles to Km Conversion problem: 542 miles * (109/68)=  ~867 km, not 917. Sorry guys! My bad. Video created: November 12th, 2o16.