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Vesna [10]
3 years ago
14

Determine the mass in grams of 4.69 x 1021 atoms of barium. (The

Chemistry
1 answer:
Virty [35]3 years ago
5 0

Answer:

1.07 g Ba

Explanation:

Hello there!

In this case, according to the definition of the Avogadro's number and the molar mass, it is possible to say that 6.022x10^{23} atoms of barium equal one mole, and at the same time, 1 mole equals 137.327 grams of this element; thus, it is possible to say that 6.022x10^{23} atoms of barium have a mass of 137.327 grams; therefore, it i possible for us to calculate the required mass in grams as shown below:

4.69x10^{21}atoms*\frac{137.327gBa}{6.022x10^{23} atoms} \\\\=1.07gBa

Best regards!

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erastovalidia [21]

Answer:

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4 0
3 years ago
Calculate the [ OH − ] and the pH of a solution with an [ H + ] = 0.090 M at 25 °C . [ OH − ] = M pH = Calculate the [ H + ] and
Valentin [98]

Answer:  a) [OH^-]=1.09\times 10^{-13} and pH = 1.04

b) [H^+]=1.02\times 10^{-11}  and pH=10.99

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Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

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