1. A sample of a gas is called ethane is analyzed and found to be 80.0g carbon and 20.0g hydrogen. What is the empirical formula for this compound?

2. A compound contains 31.2% Ca, 18.8% C, and 50.0% O. What is the empirical formula for the compound?

3. Determine the empirical formula for a compound that is composed of 43.7% phosphorus and 56.3% oxygen.

4. What is the empirical formula for a sample that contains 44.3g copper and 55.7g bromine?

5. Calculate the percentage of water in the hydrate manganese (II) nitrate tetrahydrate. (Hint: Do you need to write the formula for the hydrate?)

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

listen, you cant how young you were.

"you didn't chose the stud life. the stud life chose you."