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4 years ago

Which of measurement of distance that is used around the world?

Chemistry

2 answers:

myrzilka [38]4 years ago

7 0

500 meters is the correct nswer

hope this helps

Sonja [21]4 years ago

5 0

500 meters is the measurement of distance used around the world.

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Uses of light waves work sheet answers

kykrilka [37]

What? I don’t think anyone knows what that is

7 0

3 years ago

Give the ion notation for an atom with 34 protons and 36 electrons

alexandr402 [8]

Se - 78
Selenium - 78
or
78/34 Se2-

4 0

4 years ago

How many moles of copper are present in 75.0g Cu? Show your complete calculation and give the answer in the correct number of si

velikii [3]

Answer:

The answer to your question is 1.2 moles of copper

Explanation:

Data

mass of copper = 75 g

moles = ?

Process

1.- Look in the periodic table for the atomic mass of copper.

Atomic mass = 63.55 g/mol

2.- Use proportions to determine the moles of copper in 75 g

63.55 g of copper -------------------- 1 mol

75 g of copper -------------------- x

Use cross multiplication

x = (75 x 1) / 63.55

x = 75 / 63.55

x = 1.18 moles ≈ 1.2 moles of copper

3 0

4 years ago

Read 2 more answers

A chemist adds 135.0 mL of a 0.21M zinc nitrate (Zn(NO3) solution to a reaction flask. Calculate the mass in grams of zinc nitra

yKpoI14uk [10]

Answer:

5.36 grams the mass in grams of zinc nitrate the chemist has added to the flask.

Explanation:

$Molarity=\frac{\text{Moles of solute}}{\text{Volume of the solution (L)}}$

Moles of zinc nitrate = n

Volume of the solution = 135.0 mL = 0.1350 L

Molarity of the solution = 0.21 M

$0.21 M=\frac{n}{0.1350 L}$

$n=0.21M\times 0.1350 L=0.02835 mol$

Mass of 0.02835 moles of zinc nitrate:

0.02835 mol × 189 g/mol = 5.358 g ≈ 5.36 g

5.36 grams the mass in grams of zinc nitrate the chemist has added to the flask.

8 0

4 years ago

100 points to the person who can answer these 4 questions

Vinil7 [7]

Answer:

....,................................

Explanation:

1= A

2=D

3=C

4=C

8 0

3 years ago