How many moles of hydrogen atoms are there in 178 mL of 0.20 M H2SO4? Write your answer in
scientific notation.
Please help
You have mols H2SO4 = M x L = 0.178 x 0.2 = ?
Since there are 2 H atoms per 1 molecule H2SO4, then there will be twice as many H atoms as there are mols H2SO4.
so the answer for mols H2SO4 is 0.0356. So I have to
0.0356*2 atoms of H = 0.0712 atom of H
Am I correct?
yes
To determine the number of moles of hydrogen atoms in a given volume of a solution, you need to use the formula:
number of moles = concentration (in moles per liter) × volume (in liters)
First, convert the volume from milliliters (mL) to liters (L):
178 mL ÷ 1000 = 0.178 L
Next, you need to determine the concentration of H2SO4. The concentration is given as 0.20 M, which means there are 0.20 moles of H2SO4 per liter of solution.
Now, use the formula to calculate the number of moles of H2SO4:
number of moles = concentration × volume = 0.20 M × 0.178 L = 0.0356 moles
Since there are two hydrogens in each H2SO4 molecule, the number of moles of hydrogen atoms is twice the number of moles of H2SO4:
number of moles of hydrogen atoms = 2 × 0.0356 moles = 0.0712 moles
Finally, write the answer in scientific notation:
0.0712 moles can be written as 7.12 × 10^-2 moles.