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Natalija [7]
3 years ago
12

Zachary adds 9.7 g to 1.114 g. How many significant figures should his answer have?

Chemistry
1 answer:
makvit [3.9K]3 years ago
5 0
Always use least amount of sig figs possible. So this 9.7 would be (answer): 2 sig figs
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May someone assist, please...? I don't know how to do chemistry work...
EastWind [94]

Answer:

1) 90.0 mL

2) 11.25 M

3) 0.477 M

4) 144 mL

Explanation:

The main formula that will be used for all these calculations is:

                                                     C₁V₁ = C₂V₂

C stands for concentration and V stands for volume and the subscripts 1 and 2 indicate an initial concentration or volume and a final concentration or volume.

For each problem, it's best to start by figuring out what you have and what you need to find. Figure out if you're looking for an initial value or a final value.

1) We need to find the initial volume. So, take what values you have and plug them in and then solve for whatever variable:

5.00 M · V₁ = 500.0mL · 0.900 M                        - divide by 5.00

C₁ = 90.0 mL

2) This time we're finding the initial concentration:

20.0mL · C₁ = 150.0mL · 1.50 M                          - divide by 20.0mL

C₂ = 11.25 M

3) Now we're finding the final concentration:

12.00mL · 3.50 M = 88.0mL · C₂                         - divide by 88.0mL

C₂ = 0.477 M

4) Finally, we're looking for the final volume:

9.0mL · 8.0 M = 0.50 M · V₂                                - divide by 0.50 M

V₂ = 144mL

6 0
3 years ago
Opening a soda bottle illustrates how a decrease in pressure will___the amount of gas that can be dissolved in water.
strojnjashka [21]
C. Increase :)
I would choose C
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3 years ago
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Which biome contains mostly coniferous trees and receives 35 to 100 cm of rain per year?
fredd [130]

Answer: The Taiga Forest

Explanation: I just took the test on e2020

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Must all species reproduce in order for the species to survive? *
xz_007 [3.2K]

Answer:

NOPE

Explanation:

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In order to prepare a 0.523 m aqueous solution of potassium iodide, how many grams of potassium iodide must be added to 2.00kg o
Lerok [7]
M = amount of the solute  / mass of the <span>solvent

0.523 = x / 2.00 

x = 0.523 * 2.00

x = 1,046  moles

molar mass KI = </span><span>166.0028 g/mol
</span><span>
Mass = 1,046 * 166.0028

Mass </span>≈<span> 173.63 g

hope this helps!

</span>
6 0
3 years ago
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