3 years ago

Please Help me on this question

Chemistry

1 answer:

kirza4 [7]3 years ago

6 0

Acids: taste sour, has a pH less than 7
bases: tastes bitter, has a pH greater than 7

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How many joules are in 148 calories? (hint: 1 cal = 4.18 j)

Jet001 [13]

618.936 joules. Multiplied by 4.182 though, not much difference, but

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Electrons are never found in -

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3 years ago

Which is a base-conjugate acid pair? NH3 and CIO

ozzi

Answer:

The pair will be:

- NH3/NH4⁺

- ClO⁻/HClO

Explanation:

A conjugate acid is formed after a base has reacted/accepted a proton.

Since H2O is amphiprotic, we can use it as the acid.

NH3 + H2O ⇄ NH4⁺ + OH⁻

ClO⁻ + H2O ⇄ HClO + OH⁻

after reacting, the base form conjugate acid.

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3 years ago

What is the mole fraction of potassium dichromate, K2Cr2O7, in a solution prepared from 24.42 g of potassium dichromate and 240.

Harrizon [31]

Answer:

$6.19\times 10^{-3}$ is the mole fraction of potassium dichromate.

Explanation:

Mass of potassium dichromate = 24.42 g

Moles of potassium dichromate = $n_1=\frac{24.42 g}{294.185 g/mol}=0.0830 mol$

Mass of water = 240.0 g

Moles of water = $n_2=\frac{240.0 g}{18.015 g/mol}=13.3222 mol$

Mole fraction is calculated by:

$\chi_1=\frac{n_1}{n_1+n_2}$

$\chi_1=\frac{0.0830 mol}{0.0830 mol+13.3222 mol}=0.00619=6.19\times 10^{-3}$

$6.19\times 10^{-3}$ is the mole fraction of potassium dichromate.

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3 years ago

One mole of aluminum atoms has a mass of 27 grams. How many grams are in 9.0 moles of aluminum?

gizmo_the_mogwai [7]

27*9=243 if one mole is equal to 27 grams times that by 9

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3 years ago