Chemistry homework help, one step at a time

1. Choose Chemistry and type the question, or write it on the whiteboard.
2. Say where you're stuck: "I don't understand the question", "I don't know how to start", or "check my answer".
3. The tutor explains one step and asks you to try the next one.
4. It checks your working and points to the first step that went wrong, if any.
5. Ask for a similar question to make sure you can do it on your own.

What mass of water forms when 4 g of hydrogen burns completely? $2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}$

1. Moles of hydrogen: $n = \dfrac{m}{M} = \dfrac{4}{2} = 2$ mol.
2. Use the ratio: $\text{H}_2 : \text{H}_2\text{O} = 2 : 2$, so 2 mol of water.
3. Mass of water: $m = n \times M = 2 \times 18 = 36$ g.

At each step the tutor asks you to do the next part ("What's the molar ratio from the equation?"), and spots common slips such as using the mass of H instead of $\text{H}_2$.

See our AI chemistry tutor and how to study chemistry.

• Balance the equation before any calculation.
• Keep units with every number: g, mol, g/mol, dm³.
• For explanations, link cause to effect: "more collisions per second, so the rate increases".

TutorAura explains each question properly: what it's asking, every step with the reason it works, and the answer. Then it gives you one like it to try on your own, so you can do the next question by yourself (and in the test, where there's no help). Prefer to work it out yourself? Switch on Guide me and it coaches you one step at a time. It won't write graded essays or written answers for you to hand in. Follow your school's rules on using AI for homework.