3 years ago

What does an arrow in a chemical equation show?

2 answers:

6 0

Answer:

A chemical equation consists of the chemical formulas of the reactants (on the left) and the products (on the right). The two are separated by an arrow symbol (“→” usually read aloud as “yields”). ... The equation also identifies that all the compounds are in the gaseous state.

Explanation:

Nastasia [14]3 years ago

3 0

Answer:

Reaction arrow/yields, for example, H2 + O --> (yields) H2O

It's like the equal sign for Chem

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What is the percent composition by mass for hydrogen in water (H2O)?

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Explanation:

Percentage composition = 2/18 = 11.11%.

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he heat of fusion of tetrahydrofuran is . Calculate the change in entropy when of tetrahydrofuran melts at . Be sure your answer

lana [24]

Answer:

$\Delta S=1.8x10^{-3}\frac{kJ}{K}=1.8\frac{J}{K}$

Explanation:

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In this case, given the heat of fusion of THF to be 8.5 kJ/mol and freezing at -108.5 °C, for the required mass of 5.9 g, we can compute the entropy as:

$\Delta S=\frac{n*\Delta H}{T}$