If 10.0 g of substance X dissolved in 100 mL of solution, and the molarity of the solution is 1.0 M, what is the molar mass of substance X?
1000 g/mol
10 g/mol
1 g/mol
100 g/mol
M X = mols X/L. You know M and L, solve for mols X
Then mols X = grams/molar mass. You know grams and mols, solve for molar mass X.
100?
yes
To find the molar mass of substance X, we need to use the formula:
Molar mass = (mass of substance X) / (moles of substance X)
First, let's find the number of moles of substance X in the solution.
Moles of substance X = (mass of substance X) / (molar mass of substance X)
Given that 10.0 g of substance X dissolved in 100 mL of solution, we need to convert mL to L since molarity is given in moles per liter.
100 mL = 100/1000 L = 0.1 L
Now we can calculate the moles of substance X:
Moles of substance X = 10.0 g / (molar mass of substance X)
Given that the molarity of the solution is 1.0 M, the moles of substance X in the solution is equal to the molarity multiplied by the volume of the solution:
Moles of substance X = (molarity) * (volume of solution)
Substituting the values, we have:
10.0 g / (molar mass of substance X) = (1.0 M) * (0.1 L)
Simplifying further:
10.0 g / (molar mass of substance X) = 0.1 mol
Now, we can solve for the molar mass of substance X:
(molar mass of substance X) = 10.0 g / 0.1 mol
Therefore, the molar mass of substance X is 100 g/mol.