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allsm [11]
3 years ago
11

How many element are there on the periodic table?

Chemistry
2 answers:
Marina CMI [18]3 years ago
7 0

Answer:

118 elements

Hope that helps

givi [52]3 years ago
5 0

Answer:118

Explanation: it’s right

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The mass of a length of metal wire is 45 g. When the wire is placed in a graduated
babunello [35]
5 ml=5 cm³ , density=mass/volume=45/5= 9 g/cm³ therefore answer B
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4 years ago
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alculate the standard enthalpy of formation of ethanoic acid given that the standard enthalpy of combustion for carbon is –394 k
agasfer [191]

Answer:

The standard enthalpy of formation of ethanoic acid is -484 kJ/mol.

Explanation:

C(g)+O_2(g)\rightarrow CO_2(g),\Delta H_{1, comb}=-394 kJ/mol...[1]

H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2O(l),\Delta H_{2, comb}=-286 kJ/mol..[2]

CH_3COOH(l)+2O_2(g)\rightarrow 2CO_2(g)+2H_2O(l),\Delta H_{3, comb}=-876 kJ/mol..[3]

The standard enthalpy of formation of ethanoic acid :

2C(g)+2H_2(g)+O_2(g)\rightarrow CH_3COOH, \Delta H_{4}=?..[4]

Using Hess's law to calculate :

2 × [1] + 2 × [2] - [3] = [4]

\Delta H_4=2\times (-394 kJ/mol)+2\times (-286 kJ/mol) - (-876 kJ/mol)

=\Delta H_4=-484 kJ/mol

The standard enthalpy of formation of ethanoic acid is -484 kJ/mol.

5 0
3 years ago
24 POINTS!!!!!!!!!!!!!!!!!!!!!!!!!!!
erastovalidia [21]
I'd say b, but i'm not 100 percent sure.<span />
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3 years ago
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All are true about how does gravity aid erosion except?
Sunny_sXe [5.5K]

Answer:

I think it is b

Explanation:

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3 years ago
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What does it mean when your teacher wants you to round 143 to two significant figures
zhenek [66]

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Explanation:

143

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3

Decimals

0

Scientific Notation

1.43 × 102

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