3 years ago

Someone please help me

1 answer:

6 0

The answer is ultraviolet

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Artist 52 [7]

1st one is Science and the 2nd one is Bias

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3 years ago

amid [387]

Coffee creamer is a base because if you eat it raw then it will soak up the acid in your stomach.

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3 years ago

VARVARA [1.3K]

Answer: b

Explanation:

7 0

2 years ago

bekas [8.4K]

Answer: The standard enthalpy of formation of $H_2O(g)$ is -252.1 kJ/mol.

Explanation:

The balanced chemical reaction is,

$Fe_2O_3(s)+3H_2(g)\rightarrow 2Fe(s)+3H_2O(g)$

The expression for enthalpy change is,

$\Delta H=[n\times H_f_{products}]-[n\times H_f_{reactantss}]$

Putting the values we get :

$\Delta H=[2\times H_f{Fe}+3\times H_f{H_2O}]-[1\times H_f{Fe_2O_3}+3\times H_f{H_2}]$

$67.9kJ=[(2\times 0)+(3\times H_f{H_2O})]-[(1\times -824.2kJ/mol)+3\times 0kJ/mol)]$

$H_f{H_2O}=-252.1kJ/mol$

Thus standard enthalpy of formation of $H_2O(g)$ is -252.1 kJ/mol.

3 0

3 years ago

Alex787 [66]

Answer:

Explanation:

12*3=36

36/2=18

567890

3 0

3 years ago