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melomori [17]
3 years ago
12

Somebody help with A B and C please will give brain thanks

Chemistry
1 answer:
Norma-Jean [14]3 years ago
7 0

Answer:

we cant see a b or c

Explanation:

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How many moles are in a 111.5 gram sample of sodium chloride, NaCl?
Katarina [22]

Answer: 1.91 moles

Explanation:

First you want to find the molar mass of NaCL

Na = 22.99g  Cl = 35.45g

22.99g + 35.45g = 54.44g

Then divide 111.5g by 54.44g and this will give you moles.

5 0
3 years ago
How many moles of gas are present in 1.13 L of gas at 2.09 atm and 291 K?
raketka [301]
<h2><u>Answer:</u></h2>

n = 0.0989 moles

<h2><u>Explanation:</u></h2>

n = PV / RT

P = 2.09atm

V = 1.13L

R = 0.08206

T = 291K

Plug the numbers in the equation.

n = (2.09atm)(1.13L) / (0.08206)(291K)

n = 0.0989 moles

3 0
4 years ago
In the following reaction, how many grams of ammonia (NH3) will react with 27.8 grams of nitric oxide (NO)? 4NH3 + 6NO → 5N2 + 6
Rzqust [24]
<span>4NH</span>₃<span> + 6NO → 5N</span>₂<span> + 6H</span>₂<span>O

mol of NO  =  </span>\frac{mass of NO}{Molar Mass of NO}
 
                  =  \frac{27.8 g}{30.01 g / mol}
                   
                  =  0.93 mol

Based on the balance equation mole ratio of NH₃  :  NO  is   4 : 6
                                                                                            =  2 : 3

If mol  of NO  =  0.93 mol

then mol of NH₃ = \frac{0.93 mol  *  2}{3}
                           
                          =  0.62 mol

Mass of ammonia =  mol  ×  molar mass
          
                             =  0.62 mol   ×  17.03 g/mol
 
                             =  10.54 g

Therefore B is the best answer





3 0
3 years ago
Read 2 more answers
Which of the following statements is true of enzymes A. They're unusable after a reaction B. They don't provide an active site f
Mnenie [13.5K]
D. They act on a specific type of substrate in a reaction

Hope this helps!
3 0
3 years ago
Read 2 more answers
After 184.5 years, onky 0.625 grams of an original 20 gram sample of a radioactive isotope is left. Find the half life​
kakasveta [241]

Answer:

half-life=T= 36.9 years

Explanation:

As we know that

N ( t ) = N ( 0 ) ⋅ 0.5 ^(t/ T )

N ( 0 ) =the number of atoms you start with=20 gram

and  N ( t )=  the number of atoms left=0.625 grams

after a certain time=t=184.5 years

T=half life of a nuclide=?

Putting value in above equation we get

half-life=T= 36.9 years

.

8 0
3 years ago
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