It has 8 valence electrons because the charge is -2.
Radon is the heaviest gas on Earth with a density of about 9.73 g/L. This is very high actually.
For more informations, radon is mostly used in radioactivity and cancer therapy.
Hope this Helps :)
The oxygen which will be consumed by a person in 1 week is 393.75 moles.
The ratio of a substance's given mass in a chemical reaction to the mass of one mole of that material is the number of moles of that substance. A mole of any substance is equal to 6.023 × 10²³ or Avogadro's number. Molecular weight and other concentration units like mole per liter are also expressed using it.
No. of moles = given mass of substance / Molar mass of a substance
here, given mass = 900g
molar mass = 16g
No. of moles = 900/16 =56.25 moles
This means that 56.25 moles are consumed by a person in 1 day
No. of moles of oxygen consumed in 1 week = 56.25 ×7 = 393.75 moles
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well excuse the "s" at the end
Answer:
5 cm³.
Explanation:
The following data were obtained from the question:
Volume of water = 35 mL
Volume of water + Rock = 40 mL
Volume of rock =.?
The volume of the rock can be obtained as follow:
Volume of rock = (Volume of water + Rock) – (Volume of water)
Volume of rock = 40 – 35
Volume of rock = 5 mL
Finally, we shall convert 5 mL to cm³. This can be obtained as illustrated below:
1 mL = 1 cm³
Therefore,
5 mL = 5 cm³
Thus, the volume of the rock is 5 cm³.