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Aleksandr [31]
3 years ago
11

Be sure to use proper significant figures. The molecular weight of NaCl is 58.44 grams/mole. To prepare a 0.50 M solution: You w

ould need to have grams of NaCl in 1,000 mL of water.\
Chemistry
2 answers:
Misha Larkins [42]3 years ago
5 0
Your answer would be,
Molarity = moles of solute/volume of solution we needed, 29.22(g)(mol) of NaCI

= 29.22(g)/58.44(g)(mol^-1)(1)/1(L)
= 0.500(mol)(L^-1)



Hope that helps!!!
Mice21 [21]3 years ago
4 0
The answer to the question is 29.22
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Carbon-14 is used to date previously living matter—either plant or animal. It has a half-life of 5,730 years. A plant fossil was
Scilla [17]

Answer:

THE PLANT FOSSIL IS 11, 460 years AT A MASS OF 7 GRAMS.

Explanation:

The half life t1/2 of a radioisotope is the rate of decay of the radioisotope. It is the time taken for half of the total number of atoms in a given sample of an element to decay.

From the question, the half life is 5730 years.

Lets take the original mass of the radioactive substance as 7 grams

the final mass of the substance to be 1.75 grams

The number of half life to decay from 7 g to 1.75 grams would be;

7 grams ----------> 3.5 grams ---------> 1.75 grams

2 half life can be deducted as 7 grams decay to remain 1.75 grams.

To calculate the age of the substance, we multiply the half life by the number of decay it undergoes to remain the final mass.

How old = Half life * number of decay

How old = 5730 * 2

How old = 11,460 years.

The fossil will be 11,460 years at 7 grams before decaying.

6 0
3 years ago
12. Which rational number is least?<br>A<br>B<br>C<br>D<br>0.66<br>- 4<br>-<br>-0.6​
vazorg [7]

Answer:

yeahhhh

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4 0
3 years ago
Label the molecular shape around each of the central atoms in the amino acid glycine. hint
svetlana [45]

The Structure of Glycine is attached below and each central atom is encircled with different colors.

Molecular Shape around Nitrogen Atom (Orange):

As shown, Nitrogen is making three single bonds with two hydrogen atoms and one carbon atom hence, it has three bonded pair electrons and a single lone pair of electron. Therefore, according to VSEPR theory it has a tetrahedral electronic geometry but due to repulsion created by lone pair of electrons its molecular geometry becomes Trigonal Pyramidal.

Molecular Shape around Carbon Atom (Green):

As shown, Carbon is making four single bonds with two hydrogen atoms and one nitrogen atom one with carbon atom of carbonyl group hence, it has four bonded pair electrons. Therefore, according to VSEPR theory it has Tetrahedral geometry.

Molecular Shape around Carbon Atom (Blue):

As shown, Carbon is making two single bonds with oxygen and carbon atoms and a double bond with oxygen. Hence, it has a Trigonal Planar geometry.

Molecular Shape around Oxygen Atom (Red):

As shown, Oxygen is making two single bonds with one carbon atoms and one hydrogen atom hence, it has two bonded pair electrons and two lone pair of electrons. Therefore, according to VSEPR theory it has a tetrahedral electronic geometry but due to repulsion created by lone pair of electrons its molecular geometry becomes Bent.


6 0
3 years ago
Read 2 more answers
2. The combustion of heptane (C7H16) in oxygen spontaneously occurs. The products of the reaction are carbon dioxide and water v
masya89 [10]

The combustion of heptane (C7H16) in oxygen spontaneously occurs. The products of the reaction are carbon dioxide and water vapor. The balanced chemical equation is 7H16 + 11O2 → 7CO2 + 8H2O H = –2877.5 kJ.

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3 years ago
Which kind of statement distinguishes a term from all other terms?
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I believe the answer is a definition. 
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