Achemist measures the amount of oxygen gas produced during an experiment. he finds that 11.5 g of oxygen gas is produced. calculate the number of moles of oxygen gas produced.

0.359 moles.

Explanation:

The oxygen gas has a molecular formula O2. In table periodic, the molar mass of one atom of oxygen is 16 g/mol, so the molar mass of O is 32 g/mol.

Molar mass, mass and number of moles are related by the equation below:

Where n is the number of moles, m is the mass, and MM is the molar mass of the compound.

So, for 11.5 g of O2 produced:

n = 0.359 moles

- 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