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3 years ago

Why 5.67 + 0.00032 = 5.67 (and not 5.7 or 5.67032 or any other number).

Chemistry

1 answer:

vlabodo [156]3 years ago

5 0

The answer must show the lowest number of significant number of significant places in the decimal region

Explanation:

5.67 + 0.00032 adds up to 5.67 because the least number of significant figures in the decimal place 2.

To add up two numbers, that are in decimal places.
Identify the number of significant figures in them
Their addition should sum up to a value no more than the significant figures to the right of the decimal having the lowest accuracy.

5.67

+ 0.00032

to the right of the decimal, they have two significant numbers.

The answer should also be this way.

learn more:

Significant figures brainly.com/question/6443737

#learnwithBrainly

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This is a solution whose solvent is water.

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3 years ago

3. Determine the moles of sodium, Na, containing 7.9x1024 atoms.

-BARSIC- [3]

Answer:

12.7mol Na.

Explanation:

Hello there!

In this case, according to the concept of mole, which stands for the amount of substance, we can recall the concept of Avogadro's number whereby we understand that one mole of any substance contains 6.022x10²³ particles, for the given atoms of sodium, we can calculate the moles as shown below:

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3 years ago

Yield for this reaction?<br> Reaction: N2(g) + 3 H2(g) → 2 NH3 (g)

andriy [413]

Answer:

Yes, yield.

Explanation:

N2(g) + 3 H2(g) → 2 NH3 (g) balanced equation

First, find limiting reactant:

Moles H2 = 1.83 g x 1 mole/2 g = 0.915 moles H2

Moles N2 = 9.84 g N2 x 1 mole/28 g = 0.351 moles N2

The mole ratio of H2: N2 is 3:1, so H2 is limiting (0.915 is less than 3 x 0.351)

Theoretical yield of NH3 = 0.915 mol H2 x 2 mol NH3/3 mol H2 = 0.61 moles NH3

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3 years ago

A 2.2 M solution is made by with 0.45 moles of a solute. What is the final volume of this solution?

Savatey [412]

Answer: The final volume of this solution is 0.204 L.

Explanation:

Given: Molarity of solution = 2.2 M

Moles of solute = 0.45 mol

Molarity is the number of moles of solute present divided by volume in liters.

$Molarity = \frac{no. of moles}{Volume (in L)}$

Substitute the values into above formula as follows.

$Molarity = \frac{no. of moles}{Volume (in L)}\\2.2 M = \frac{0.45}{Volume}\\Volume = 0.204 L$

Thus, we can conclude that the final volume of this solution is 0.204 L.

7 0

3 years ago