Give three examples of electron configuration‘s for atoms on the periodic table with the same activity that can be attribute it to there being two electrons in the outer most energy level.
pls idk what this means or how to do it : )
5.787 x 10²³ atoms.
explanation:firstly, we should calculate the mass of this sample.we have the relation (m = d x v), where m is the mass of the element, d is the density of the element (d of hg = 13.56 g/cm³) and v is the volume of the element (v = 14.214 ml).m = d x v = (13.56 g/cm³) (14.214 ml) = 192.74 g.now, we can calculate the number of moles of hg in this sample: n = mass / atomic mass = (192.74 g) / (200.59 g/mole) = 0.96 mole.it is known that 1.0 mole of the element contains avogadro's number of atoms (6.023 x 10²³).
using cross multiplication:
1.0 mole of hg → 6.023 x 10²³ atoms
0.96 mole of hg → atomsthe atoms of hg in 14.214 ml sample is = (0.96 mole x 6.023 x 10²³ atoms) / (1.0 mole) = 5.787 x 10²³ atoms.
we know we will need a balanced equation with masses and molar masses, so let’s gather all the information in one place.
m_r: 127.91 253.81
2hi ⟶ h₂ + i₂
(a) calculate the moles of hi
n = 506 g hi × (1 mol hi/127.91 g hi)
n = 3.955 mol hi
(b) calculate the moles of i₂
the molar ratio is (1 mol i₂/2 mol hi)
n = 3.955 mol hi × (1 mol i₂/2 mol hi)
n = 1.978 mol hi
(c) calculate the mass of i₂
m = 1.978 mol i₂ × (253.81 g i₂/1 mol i₂)
m = 502 g i₂
answer : the rms speed of the molecules in a sample of gas at 300 k will be four times larger than the rms speed of molecules at the same temperature, and the ratio constant with increasing temperature.
formula used for root mean square speed :
= rms speed of the molecule
r = gas constant
t = temperature
m = molar mass of the gas
at constant temperature, the formula becomes,
and the formula for two gases will be,
molar mass of = 32 g/mole
molar mass of = 2 g/mole
now put all the given values in the above formula, we get
therefore, the rms speed of the molecules in a sample of gas at 300 k will be four times larger than the rms speed of molecules at the same temperature.
and the ratio constant with increasing temperature because rms speed depends only on the molar mass of the gases at same temperature.