Answer:97.8amu
Explanation:
The relative atomic mass of molybdenum is the sum of the masses of all the isotopes of molybdenum in nature.
(90.6/100 × 95.9/1) + (9.4/100 × 94.9/1) =
(0.906×95.9) + (0.094×94.9)=
86.8854+8.9206=97.8amu
Answer:
So we are given with the mass while we are asked for the amount of volume. So this means, we must need an information on the density. From literature, the density of human fat is 0.918 g/cm³. Convert grams to lb by the conversion that 1,000 g = 2.2 lbs.
Density = 0.918 g/cm³ * (2.2 lbs/1,000 g) = 0.0020196 lb/cm³
Volume = Mass/Density = 12.2 lb / 0.0020196 lb/cm³
Volume = 6,040.8 cm³
To answer this item, we assume that the gases are ideal for us to be able to use the ideal gas law.
PV = nRT
where P is pressure, V is volume, n is the number of moles, R is the universal gas constant and T is the temperature (in K)
Substituting the known values,
(0.963 atm)(6.92 L) = n(0.0821 L.atm/mol.K)(298 K)
The value of n from the equation is n = 0.27237 moles
We let x and y be the number of moles of NO2 and N2O4, respectively. Given the calculated total moles above and the total mass,
x + y = 0.27237
30x + 60y = 12.55
The values of x and y are:
x = 0.126 moles
y = 0.146 moles
The mole fractions of each gases are therefore:
mole fraction of NO2 = 0.126/(0.126 + 0.146) = 0.46
mole fraction of N2O4 = 0.146/(0.126 + 0.146) = 0.54
Mass of calcium carbonate (in grams) can be dissolved by 4.1 g of Hcl is 5.62g.
<h3>What is balanced equation?</h3>
A balanced equation is one for a chemical reaction in which the overall charge and the number of atoms for each component are the same for both the reactants and the products. In other words, the mass and charge of both sides of the reaction are equal.
The reaction between calcium carbonate and hydrochloric acid can be expressed through the chemical reaction,
CaCO₃ + 2HCl --> CaCl₂ + H₂O + CO₂
Hydrochloric acid has a molecular weight of 36.45 g/mol compared to calcium carbonate's molecular weight of 100 g/mol. According to the equation above, 72.9 g of hydrochloric acid may dissolve 100 g of calcium carbonate.
x = (4.1 g HCl)(100 g CaCO3 / 72.9 HCl)
x = 5.62 g.
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Answer:
The answer to your question is A.
Pure substances can not be broken down into others, so they cannot be molecules
Explanation: