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2 years ago

How many grams of Sodium carbonate (Na2CO3) contain 1.773x10^17 carbon atoms?

1 answer:

7 0

An important information or constant to recall here is the Avogadros constant. This will help us solve how many moles are there from the number of atoms given. These is how we proceed: $1.773x10^ {17}* \frac{ mol}{6.02*10^{23}} * \frac{1 mole Na2CO3}{1 moleC}* \frac{105.98g Na2CO3}{mol} = 3.12 * 10^{-5}$

Answer: 3.12 * 10^{-5} grams of Sodium carbonate (Na2CO3)

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What is the pH of a solution that has a pOH of 5.9

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Answer:

pH = 8.1

Explanation:

Assuming that we are at 25 degrees Celsius, pH + pOH = 14.

We can then plug in the given pOH and solve for pH:

pH + pOH = 14

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2 years ago

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3 years ago

When 0.5141 g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.823 °C to 29.419 °C

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Answer:

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Therefore, $\Delta_{r}U$ of the reaction is -6313 kJ/mol.

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$C_{12}H_{10}(s)+\frac{27}{2}O_{2}(g)\rightarrow 12CO_{2}(g)+5H_{2}O(g)$

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Therefore, $\Delta_{r}H$ of the reaction is -6312 kJ/mol.

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3 years ago

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Carbon has 4 valence electrons so to gain a noble gas electron configuration, which has 8 valence electrons and is the most electrically stable, carbon needs 4 more electrons.

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2 years ago