# Tutor profile: Esther W.

## Questions

### Subject: Chemistry

If you dissolve 1 kilograms of sulfuric acid (H2SO4) into 2.50 L of water, what is the concentration?

1. Determine the molar mass of sulfuric acid (H2SO4) 2(1.008)+1(32.08)+4(15.999) = 98.056 g/mole of sulfuric acid 2. Convert kilograms to grams (1 kilograms of sulfuric acid) x (1000 grams/ 1 kilogram) = 1000 grams of sulfuric acid 3. Determine the moles of sulfuric acid in your sample. (1000 grams of sulfuric acid) x (1 mole sulfuric acid / 98.056 g sulfuric acid) = 10.198 moles sulfuric acid 4. Determine the concentration (M). M= mol/ L = (10.198 mole sulfuric acid / 2.5 L) = 4.08 M sulfuric acid

### Subject: Basic Chemistry

What is combustion?

Combustion is the process of burning something with oxygen, releasing carbon dioxide and water vapor. An example of this would be the combustion of methane which is known as a natural gas.

### Subject: Algebra

If you drive at the speed limit of 65 miles an hour, how many minutes does it take to drive to your destination that is 455 miles away?

1. Identify the rate (65 miles/ hour) 2. Set up your conversation. *Check to make sure your units cancel and the unit you want remains.* (455 miles) x (1 hour / 65 miles) 3. Solve for hours. (7 hours) 4. Convert to minutes. *Check to make sure your units cancel and the unit you want remains.* (7 hours) x (60 minutes / 1 hour) = 420 minutes

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