Express the answer in scientific notation and with the correct number of significant figures: (6.32 x 10-4) ÷ 12.64

Chemistry

2 answers:

anygoal [31]3 years ago

6 0

Answer:

$5.00*10^{-5}$

Explanation:

$\frac{6.32*10^{-4} }{12.64} = 0.00005= 5.00*10^{-5}$

The answer is in three significant figures because that is the least number of significant figures in any of the numbers involved in the calculation

elixir [45]3 years ago

4 0

Express the answer in scientific notation and with the correct number of significant figures:
(6.32 x 10-4) ÷ 12.64
5.00 x 10^-5

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3 years ago

Calculate the mass, in grams, of Ag2CrO4 that will precipitate when 50.0mL of 0.20M AgNO3 solution is mixed with 40.0mL of 0.10M

Darina [25.2K]

Answer:

1.327 g Ag₂CrO₄

Explanation:

The reaction that takes place is:

2AgNO₃(aq) + K₂CrO₄(aq) → Ag₂CrO₄(s) + 2KNO₃(aq)

First we need to identify the limiting reactant:

We have:

0.20 M * 50.0 mL = 10 mmol of AgNO₃

0.10 M * 40.0 mL = 4 mmol of K₂CrO₄

If 4 mmol of K₂CrO₄ were to react completely, it would require (4*2) 8 mmol of AgNO₃. There's more than 8 mmol of AgNO₃ so AgNO₃ is the excess reactant. That makes K₂CrO₄ the limiting reactant.

Now we calculate the mass of Ag₂CrO₄ formed, using the limiting reactant: