Combustion of hydrogen releases 142 j/g of hydrogen reacted. How many kj of energy are released by the combustion of 16.0 oz of

The result is 200 g. Given that the molar mass of CaCl2 is 110.98 g/mol, this indicates that there are 110.98 g in 1 L of a 1 M solution. Let's calculate the amount of CaCl2 in 0.720 M. Using the proportion 110.98 g: 1 M = x: 0.720 M, we find x to be 79.90 g. Therefore, in 1 L of a 0.720 M solution, there is 79.90 g. Next, we need to create ten beakers with 250 mL each, totaling 10 * 250 mL = 2500 mL or 2.5 L. Then, using the equation 79.90 g: 1 L = x: 2.5 L, we calculate x = 79.90 g * 2.5 L: 1 L, resulting in x = 199.75 g, approximately 200 g.

What precisely is being followed here?

Answer:

A) The molecular formula for ibuprofen is

B) The molecular formula for Cadaverine is

C) The molecular formula for Epinephrine is

Explanation:

Element percentage in a compound:

A) The composition of ibuprofen, used for headaches, consists of 75.69% carbon, 8.80% hydrogen, and 15.51% oxygen by weight.

Ibuprofen has a molar mass of 206 g/mol.

The proposed molecular formula for ibuprofen is =

Count of carbon atoms in one ibuprofen molecule;

Count of hydrogen atoms in one ibuprofen molecule;

Count of oxygen atoms in one ibuprofen molecule;

Molecular formula for ibuprofen:

=

B) Cadaverine consists of 58.55% carbon, 13.81% hydrogen, and 27.40% nitrogen by weight

Cadaverine has a molar mass of 102.2 g/mol.

The proposed molecular formula for Cadaverine is =

Count of carbon atoms in one Cadaverine molecule;

Count of hydrogen atoms in one Cadaverine molecule;

Count of nitrogen atoms in one Cadaverine molecule;

Molecular formula for Cadaverine:

=

C) Epinephrine includes 59.0% carbon, 7.1% hydrogen, 26.2% oxygen, and 7.7% nitrogen by weight

Epinephrine has a molar mass of 180 g/mol.

The proposed molecular formula for Epinephrine is =

Count of carbon atoms in one Epinephrine molecule;

Count of hydrogen atoms in one Epinephrine molecule;

Count of oxygen atoms in one Epinephrine molecule;

Count of nitrogen atoms in one Epinephrine molecule;

Molecular formula for Epinephrine:

=

We assume that the stated 50% is measured by volume. Molarity defines the concentration in terms of moles of solute per volume of solution.

      To find the moles of NaOH, use: (0.1 moles / L)(0.4 L)
                      n = 0.04 moles of NaOH

Assuming we start with 1 mL of 50% NaOH solution, 
  
                        (1 mL solution)(1.525 g/mL)(0.50) = 0.7625 g
Then, the number of moles calculates as follows,[
                  0.7625 g NaOH x (1 mol / 40 g) = 0.01906 moles of NaOH

                The volume of solution required can be determined by:(0.04 moles of NaOH)(1 mL solution / 0.01906 moles of NaOH)
                 
                 Thus, the needed volume comes out to be 2.09 mL

Answer: 2.09 mL

Answer:

Endothermic: water formation from ice and a cold instant ice pack  Explanation: