It’s gonna be C , I did it already
Answer:
Lithium formula=Li+
Oxygen formula=O2(2-)
Explanation:
Quick note: These kinds of formula are really easy to google. Next time, google the chemical name, include the charge and include "formula" and you should get the answer.
Answer:
A. The mass of the solid formed is 0.5g
Explanation:
An experimental observation can either be QUANTITATIVE OR QUALITATIVE. A quantitative observation is that which uses numerical representation to describe collected data. Examples are height, volume, mass etc.
According to this question, a student performs an experiment in which two liquids were mixed to result in the formation of a WHITE SOLID in the solution. Based on the options provided, the quantitative observation that could be derived from the result of this experiment is that "The mass of the solid formed is 0.5g".
Note that, the option that states that: volume of 10 mL of each of the liquid components was used in the experiment is also a qualitative observation but it is not derived from the RESULT of the experiment.
Answer : The initial quantity of sodium metal used is 17.25 grams.
Solution : Given,
Volume of gas = 8.40 L
Molar mass of Na metal = 23 g/mole
The Net balanced chemical reaction is,
At STP, 22.4 L of volume is occupied by 1 mole of gas
so, 8.40 L of volume is occupied by = = 0.375 moles of gas
Now from the above reaction, we conclude that
1 mole of gas produced by the 2 moles of Na metal
0.375 moles of gas produced = of Na metal
The quantity of Na metal used = Moles of Na metal × Molar mass of Na metal = 0.75 moles × 23 g/mole = 17.25 grams
Therefore, the initial quantity of sodium metal used is 17.25 grams.