2na + 2h2o → 2naoh + h2

during a laboratory experiment, a certain quantity of sodium metal reacted with water to produce sodium hydroxide and hydrogen gas. what was the initial quantity of sodium metal used if 6.30 liters of h2 gas were produced at stp?

13 grams

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 Liters at STP and contains avogadro's number of particles.

According to stoichiometry,

1 mole of is produced from 2 moles of sodium

or 22.4 L of at STP is produced from =2 moles of sodium

thus 6.30 L of at STP is produced from = of sodium

To calculate the mass of sodium metal used

Thus the initial quantity of sodium metal used is 13 grams.

b.final

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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