What did the Curies conclude about radioactivity based on their studies?

-You wish to make a 0.203 M hydrochloric acid solution from a stock solution of 6.00 M hydrochloric acid. How much concentrated

lubasha [3.4K]

For all three questions, we will use the fact that

molarity = (moles of solute)/(liters of solution)

1) For 175 mL of solution at 0.203 M, this means that:

0.203 = (moles of solute)/0.175
moles of solute = 0.035523 mol

Considering the hydrochloric acid solution, if we have 0.035523 mol, then:

6.00 = 0.035523/(liters of solution)
liters of solution = 0.035523/6.00 = 0.0059205 = 5.92 mL (to 3 sf)

2) If there is 20.3 mL = 0.0203 L, then:

8.20 = (moles of solute)/0.0203
moles of solute = 0.16646 mol

This means that the molarity of the diluted solution is:

0.16646/(0.200) = 0.832 M (to 3 sf)

3) If we need 1.50 L of 0.700 M solution, then:

0.700 = (moles of solute)/1.50
moles of solute = 1.05 mol

Considering the 9.36 M acid solution, from which we need 1.05 mol of perchloric acid from,

9.36 = 1.05/(liters of solution)
liters of solution = 1.05/9.36, which is 0.11217948717949 L, or 112 mL (to 3 sf)

8 0

2 years ago

At 9 a.m. on May 21, a body is discovered near a path in a park. The body is 10 feet from a tree beside the path. The body is pa

katrin2010 [14]

I'm pretty sure its D, Time of discovery of the body. Let me know (:

4 0

3 years ago

Read 2 more answers

PLEASE ANSWER ASAP

marta [7]

Its an inelastic collision because the force from the bat causes it to bounce back. It is also an elastic force because catching the ball call for the energy of the ball to be deformed and restored into the mitt.

8 0

3 years ago

Whats the difference between Physics and Chemistry?

KonstantinChe [14]

Physics: Physics is more focused to finding the universal laws of general processes

Chemistry: Chemistry focuses more on details and specific phenomena, such as what is the boiling point of this substance and why.

4 0

3 years ago

A mechanism for the decomposition of ozone is (2 O3 â†’ 3 O2). O3 â‡Œ O2 + OO + O3 â†’ O2 + O2What is the molecularity for the f

Gnesinka [82]

Answer:

The correct answer is option c.

Explanation:

Molecularity is defined as number of atoms , ions or molecules that must collide with one another so as to result in a chemical reaction.It is simply the sum of molecules of different reactants as represented in balanced chemical equation.

Reaction taking place in one step are said to be elementary reaction.

Reaction taking place in more than one step are said to be complex reaction.

A mechanism for the decomposition of ozone is given as:

1) $O_3 \rightarrow O_2 + O$

Molecularity for the first elementary reaction is 1. This because single ozone molecule is present.

2) $O + O3\rightarrow O_2 + O_2$

Molecularity for the second elementary reaction is 2. This because single ozone molecule reacts with 1 oxygen atom.

3 0

3 years ago