# Tutor profile: Jessie P.

## Questions

### Subject: Chemistry

The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

Here One drop of water has the volume 0.0018 mL. Because the density of water is 1, the mass is 0.0018 g. The molar mass of water (H2O) is 18.0 grams/mol (1.008 + 1.008 + 16.0). This means there is one mole of water in 18.0 grams. One mole is 6.02 x 1023 molecules. Then you can convert grams to number of atoms: 0.0018 grams / 18.0 grams x (6.02 x 10exp19 molecules) So the answer would be 6.023 x 10^19 molecules

### Subject: Basic Chemistry

Balance the following equation and find the limiting reactant if there is 6.33g of P4O10 and 5 grams of water. P4O10 + H2O -----> H3PO4

P4O10 + 6H2O -----> 4H3PO4 Mole Ratio 6:4 H2O to H3PO4 Limiting Reactant: Water, because you can only product 18.13 grams of the product not the full 18.5 grams you can produce when you use P4H10

### Subject: Algebra

Write a system of equations to describe the situation below, solve using an augmented matrix, and fill in the blanks. Sparkles the Clown makes balloon animals for children at birthday parties. At Tommy's party, he made 2 balloon poodles and 5 balloon giraffes, which used a total of 22 balloons. For Ian's party, he used 4 balloons to make 1 balloon giraffe. How many balloons does each animal require? Each poodle requires ____ balloons and each giraffe requires ______ balloons.

Each poodle requires 1 balloon and each giraffe requires 4 balloons. 2x + 5y = 22 0x + 1y = 4 Solve using matrix to find how many balloons each animal needs

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