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3 years ago

Why are forecasters able to make more accurate predictions about the weather when using electronic tools?

Chemistry

1 answer:

Lelechka [254]3 years ago

4 0

Answer:

option 1

Explanation:

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3 years ago

Calculate the concentration of a solution formed by dissolving 5.6 g of potassium

gayaneshka [121]

The concentration of solution : 0.2 M

<h3> Further explanation </h3>

Given

5.6 g Potassium hydroxide(KOH)

500 ml of solution = 0.5 L

Required

The concentration

Solution

Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution

MW KOH = 39+16+1=56 g/mol

mol solute(KOH) :

= mass : MW KOH

= 5.6 : 56 g/mol

= 0.1

Molarity :

= 0.1 : 0.5

= 0.2 M

7 0

3 years ago

What is the mass of sodium (Na) in 50 grams of table salt (NaCl)? Show your work.

beks73 [17]

Answer:

The amount of sodium in this sample = 32.4 grams

Explanation:

Mass of Sodium = 23 g/mol

Mass of Chlorine = 35.5 g/mol

Mass of NaCl = 35.5 g/mol

Fraction of Na in NaCl = $\frac{23}{35.5}$

=0.648

We are given a sample of 50 grams of sodium chloride.

The amount of sodium in this sample = $Amount of sodium in 1 gram sample \times weight of sample$

The amount of sodium in this sample = $0.648 \times 50$

The amount of sodium in this sample = 32.4 grams

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4 years ago