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faust18 [17]
3 years ago
12

Table salt is 42.7% sodium how many grams of salt contain 76 g of sodium

Chemistry
1 answer:
Alexeev081 [22]3 years ago
3 0

Answer:

Số gam muối ăn cần là 76:42,7%=177,986 g

Explanation:

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Explanation:

The valence electrons within an atom is the number of electrons in its outermost shell.

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What happens to water during evaporation?
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D would be your best bet because evaporation occurs when water is heated, it then vibrates and then magic!
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How many bromines atoms are present in 33.3 g of ch2br2?
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8 0
3 years ago
A mixture containing 0.477 mol he(g), 0.265 mol ne(g), and 0.115 mol ar(g) is confined in a 7.00-l vessel at 25 ∘c. part a calcu
enot [183]
Q1)
we can use the ideal gas law equation to find the total pressure of the system ;
PV = nRT
where P - pressure
V - volume - 7 x 10⁻³ m³
n - number of moles 
total number of moles - 0.477 + 0.265 + 0.115 = 0.857 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature in K - 273 + 25 °C = 298 K
substituting the values in the equation 
 P x 7 x 10⁻³ m³ = 0.857 mol x 8.314 Jmol⁻¹K⁻¹ x 298 K
P = 303.33 kPa
1 atm = 101.325 kPa
Therefore total pressure - 303.33 kPa / 101.325 kPa/atm = 2.99 atm

Q2)
partial pressure is the pressure exerted by the individual gases in the mixture.
partial pressure for each gas can be calculated by multiplying the total pressure by mole fraction of the individual gas.

total number of moles - 0.477 + 0.265 + 0.115 = 0.857 mol
mole fraction of He - \frac{0.477}{0.857}  = 0.557
mole fraction of Ne - \frac{0.265}{0.857} =   0.309
mole fraction of Ar - \frac{0.115}{0.857}  = 0.134
partial pressure - total pressure x mole fraction
partial pressure of He - 2.99 atm x 0.557 = 1.67 atm
partial pressure of Ne - 2.99 atm x 0.309 = 0.924 atm
partial pressure of Ar - 2.99 atm x 0.134 = 0.401 atm
6 0
3 years ago
Is calcium and chlorine am Ionic bond? Yes
iren2701 [21]
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4 years ago
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