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Irina-Kira [14]
3 years ago
7

Which element is classified as a

Chemistry
1 answer:
Yuki888 [10]3 years ago
5 0

Answer: Boron

Explanation:

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Can someone help me? It needs to have a diagram that has arrows.
daser333 [38]

Answer: The enthalpy change for formation of butane is -125 kJ/mol

Explanation:

The balanced chemical reaction is,

C_4H_{10}(g)+\frac{13}{2}O_2(g)\rightarrow 4CO_2(g)+5H_2O(l)

The expression for enthalpy change is,

\Delta H=[n\times H_f{products}]-[n\times H_f{reactants}]

Putting the values we get :

\Delta H=[4\times H_f_{CO_2}+5\times H_f_{H_2O}]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times H_f_{O_2}]

-2877=[(4\times -393)+(5\times -286)]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times 0]

H_f_{C_4H_{10}=-125kJ/mol

Thus enthalpy change for formation of butane is -125 kJ/mol

5 0
3 years ago
Which of the following is an acid-base neutralization reaction?
ZanzabumX [31]

Answer:

Explanation:

Answer: D

STRONG ACIDS:

HBr

HCl

HI

HNO3

HClO4

H2SO4

8 0
2 years ago
Which is NOT a property of gold?
DENIUS [597]

Answer:

Rareness, the others describe what the gold is and its properties.

6 0
3 years ago
Barium acetate, Ba(C2H3O2)2, is a common barium salt that is highly poisonous. It was featured in a 2001 episode of Forensic Fil
aleksley [76]

Answer:

209.68

Explanation:

The only number that is relevant (though the rest are quite interesting) is the last one 1.98 * 10^24

1 mole of Barium Acetate Contains 6.02*10^23 particles.

There are 4 moles of carbon to every mole of Barium Acetate.

1.98 * 10^24 atoms / (4*6.02*10^23)

0.8223 moles of Ba(C2H3O2)2

Ba =                 137

4C = 4*12          48

6H = 6*1              6

4O = 4*16           64

1mole                 255 grams

0.8223 * 255 = 209.68 grams  

I have used rounded masses for these elements depending on the periodic table you use. Go through the question with your masses to get a more accurate answer. My answer will not differ by much. It is a guide.

8 0
3 years ago
How many atoms are in 1 mole of ca
Tju [1.3M]

Answer: 6.023 x 10^23

Explanation:

5 0
3 years ago
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