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Sidana [21]
3 years ago
15

Elzmall.org Bookmark

Chemistry
1 answer:
soldier1979 [14.2K]3 years ago
4 0
I believe the answer is PD 6
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A gas sample with a mass of 12.8 g exerts a pressure of 1.2 atm at 15°c and a volume of 3.94 l. what is the molar mass of the ga
Kryger [21]
We can use the ideal gas law equation to find the number of moles in the gas
PV = nRTwhere P - pressure - 1.2 atm x 101 325 Pa/atm = 121 590 Pa
V - volume - 3.94 x 10⁻³ m³
n - number of moles 
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature - 15 °C + 273 = 288 K
substituting the values in the equation 
121 590 Pa x 3.94 x 10⁻³ m³ = n x 8.314 Jmol⁻¹K⁻¹ x 288 K
n = 0.200 mol
molar mass of gas is = mass / number of moles 
molar mass = 12.8 g / 0.200 mol = 64 g/mol 
molar mass of gas is 64 g/mol
3 0
3 years ago
Read the given expression. X = number of protons − number of core electrons Which of the following explains the identity of X an
shepuryov [24]

<u>Answer: </u>The correct statement is X is the effective nuclear charge, and it increases across a period.

<u>Explanation:</u>

We are given that:

X = number of protons − number of core electrons

Effective nuclear charge is defined as the actual nuclear charge (Z = number of protons) minus the screening effect caused by the electrons present between nucleus and valence electrons. These electrons are the core electrons.

The formula used for the calculation of effective nuclear charge given by Slater is:

Z^*=Z-\sigma

where,

Z^* = effective nuclear charge

Z = atomic number or actual nuclear charge or number of protons

\sigma = Screening constant

The effective nuclear charge increases as we go from left to right in a period because nuclear charge increases with no effective increase in screening constant.

Hence, the correct answer is X is the effective nuclear charge, and it increases across a period.

5 0
4 years ago
The molecules of Any Given substance are always
katrin2010 [14]
They are always in motion<span />
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4 years ago
A potassium ion (K+) would most likely bond with?
ivanzaharov [21]
It's most likely to bond with chlorine.
6 0
3 years ago
Convert 0.185mol sucrose (C12H22O11) into grams.
viktelen [127]
1) Find the molar mass of sucrose: 12*12 + 22*1 + 11*16 = 342 g/mol

2) Multiply the molar mass by the number of mols: 0.185 mol * 342 g/mol = 63.27 g
3 0
4 years ago
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