Answer:
269.12gmol-1
Explanation:
The molecular mass of the unknown gas is obtained from Graham's law. First the respective rates of diffusion for oxygen and the unknown gas are obtained from information given in the question. The relative molecular mass of oxygen gas is calculated based on the relative atomic mass of oxygen known to be 16. These are now substituted into the equation as shown in the image attached.
Hello!
1) What is the limiting reactant?The chemical equation for the reaction is the following:
Fe + S → FeS
To determine the limiting reactant, we will determine the
moles of each reactant and divide it by the coefficient in the chemical equation (In this case is I for each one)
Now, the reactant with the less number of moles is Fe, so
Fe is the limiting reactant.
2) The reactant in excess.
From the chemical reaction:
Fe + S → FeS
The reactant in excess is the one that is in the
highest amount. To determine which is the reactant in excess we need to calculate the moles of each reactant and divide by the coefficient in the chemical reaction:
The reactant in excess is S, the amount that is left after the reaction is:
So there are
0,2679 moles of S in excess after the reaction.
3)
What mass of FeS is created?To determine the mass of FeS created we need to go from moles of Fe (Limiting reactant) to grams of FeS (Product) using the following conversion factor:
So,
23,99 grams of FeS are produced from this chemical reaction.
Have a nice day!
Answer:
The fox who shed their heavy coat in the summer.
Explanation:
If a fox has the ability to shed its coat in the summer, it will have no difficulties adapting to new temperatures even during winter. However, the heavy-coated one will.
The correct answer is molecular formula = 2 x empirical formula
The given compound C2H10N2 is the molecular formula because the ratios of the elements are not reduced into lowest terms (empirical formula). To get the empirical formula, the ratios must be reduced to the smallest possible integral ratio which gives CH5N. As a result, the ratio between both formulas is 2.
Answer:
B. 0.2.
Explanation:
<em>n = mass/molar mass</em>
mass of CaCO₃ = 20 g, molar mass of CaCO₃ = 100.0869 g/mol.
<em>∴ n = mass/molar mass = </em>(20 g)/(100.0869 g/mol) <em>= 0.1998 ≅ 0.2 mol.</em>
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<em>So, the right choice is: B. 0.2.</em>