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Korvikt [17]
3 years ago
7

How many moles of calcium atoms do you have if you have 3.00 × 10²¹ atoms of calcium. (The mass of one mole of calcium is 40.08

g.)
Chemistry
2 answers:
Talja [164]3 years ago
5 0

Answer:

0.0050moles

Explanation:

Since

1 mole=6.022×10^23

X mole=3.0×10^21

Cross multiply

6.022×10^23x=3.0×10^21

Divide both sides by 6.022×10^23

x=0.00498~0.0050moles

So the final answer is 0.0050moles

Nadya [2.5K]3 years ago
3 0

Answer:

4.98x10^-3 mole

Explanation:

According to Avogadro's hypothesis, 1 mole of any substance contains 6.02x10^23 atoms. This greatly implies that 1 mole of calcium will also contain 6.02x10^23 atoms.

Now, if 1 mole of calcium contains 6.02x10^23 atoms,

then Xmol of calcium will contain 3x10^21 atoms i.e

Xmol of calcium = 3x10^21/6.02x10^23

Xmol of calcium = 4.98x10^-3mol

Therefore, 4.98x10^-3 mole of calcium contains 3x10^21 atoms

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Answer:

the correct answer is four decimal places

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3 years ago
what kind of evidence indicates a chemical change ?... a physical change? you may use examples to show softened.
SOVA2 [1]
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3 years ago
A student prepares a weak acid solution by dissolving 0.2000 g HZ to give 100. mL solution. The titration requires 33.5 mL of 0.
nexus9112 [7]

Answer:

a)M=0.20/(0.335*0.1025)= 0.20/ 0.034 = 5.88 g/mol

b) if 0.100g is used instead of 0.200g

M = 0.1 / 0.034 = 2.94  hence the molar mass will be too low

Explanation:

0.2000 gHZ gives  100ml acid solution

33.5 ml of 0.1025 M NaOH  is required to prepare it

the moles = mass / molar mass

mass = 0.200 gHZ

moles = 0.0335*100 * 0.1025 = 0.034

therefore molar mass = mass / moles

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if 0.100g is used instead of 0.200g

M = 0.1 / 0.034 = 2.94  hence the molar mass will be too low

3 0
3 years ago
You have two sealed jars of water at the same temperature. In the first jar there is a large amount of water. In the second jar
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since both the jars are kept at the same temperature the vapor pressure will be same in both the cases.


3 0
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Which of the following types of rocks are likely to be formed due to compacting and cementing?
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Answer:

Sedimentary only

Explanation:

when compacting and cementing happens then a sedimentary rock can and is made!

hope this helps!

3 0
2 years ago
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