Answer:
number of moles = 0.21120811
Explanation:
To find the number of moles, given the mass of the solute, we use the formula:
Label the variables with the numbers in the problem:
The first thing we have to do is find the molar mass of sodium sulfate, in order for us to use the formula for finding the number of moles:
Formula for finding the molar mass of sodium sulfate:
For the variables and what they mean are below for finding the molar mass of sodium sulfate:
Plug the numbers into the formula, to find the molar mass of sodium sulfate:
Now that we have found the molar mass, we can calculate the number of moles in the solution of sodium sulfate with the formula:
0.21120811 rounded gives you 0.2112
or if you did the problem without decimals
30 grams of sodium sulfate divided by its molecular weight – which we found to be 142 – gives us a value of 0.2113 moles.
Answer:
3.0 × 10²⁰ molecules
Explanation:
Given data:
Mass of ethanol = 2.3 × 10⁻²°³ g
Number of molecules = ?
Solution:
Number of moles of ethanol:
Number of moles = mass/ molar mass
Number of moles = 2.3 × 10⁻²°³ g / 46.07 g/mol
Number of moles = 0.05 × 10⁻²°³ mol
Number of molecules:
One mole = 6.022 × 10²³ molecules
0.05 × 10⁻²°³ mol × 6.022 × 10²³ molecules / 1 mol
0.30 × 10²⁰°⁷ molecules
3.0 × 10¹⁹°⁷ molecules which is almost equal to 3.0 × 10²⁰ molecules.
Answer:
Fossil fuels
Explanation:
Fossil fuels — natural gas, coal, and petroleum, and — provide most (63 %) of the energy consumed in the United States
The breakdown in 2019 was
Natural gas 38 %
Coal 24 %
Petroleum 1 %
Answer:
A. 6 water molecules, hydrogen is limiting.
Explanation:
For a molecule of water, you need 2 hydrogen atoms and 1 oxygen atom. Therefore, if there is 6 molecules of hydrogen and 6 molecules of oxygen, there are 12 atoms of hydrogen and 12 atoms of oxygen. You need 2 of hydrogen so you will divide 12 by 2. 12-2=6. You need only 1 atom of oxygen so it will stay as 12. The limiting reactant is hydrogen because there are only 6 while there are 6 atoms of oxygen remaining. There will only be 6 water molecules formed due to the insufficient amount of hydrogen.
The milk of magnesia is a
suspension of magnesium hydroxide in water, which is a strong base that is used
to neutralize excess stomach acid. The presence of stomach acid or hydrochloric
acid (HCl) that is known to be a strong acid will react with the strong base and
neutralization reaction occurs since conjugate partners produced negligible
strength where the products are a salt and water.
