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photoshop1234 [79]
2 years ago
6

What is the weight of:

Chemistry
1 answer:
Dafna11 [192]2 years ago
8 0

Answer:

Oxygen = 15.999 g/mol

Iron = 3 × 55.845 = 167.535 g/mol

CaCO3 = 20 × 100.0869 = 2001.738 g/mol

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Calculate the molarity of a solution of Nach if it contains 7.2.g Nach in 100.0 mL of solution. andver: m Nach . .
Norma-Jean [14]

Answer:

1.23 M

Explanation:

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity  

V = volume of solution in liter ,

n = moles of solute ,

Moles is denoted by given mass divided by the molecular mass ,  

Hence ,  

n = w / m

n = moles ,  

w = given mass ,  

m = molecular mass .

From the question ,

w = given mass of NaCl = 7.2 g

As we know , the molecular mass of NaCl = 58.5 g/mol

Moles is calculated as -

n = w / m  =  7.2 g / 58.5 g/mol = 0.123 mol

Molarity is calculated as -

V = 100ml = 0.1 L            (since , 1 ml = 1/1000L )

M = n / V  =  0.123 mol / 0.1 L = 1.23 M

5 0
3 years ago
What is the primary reason that atomic radius decreases as you move from left to right across the periodic table even through th
Anika [276]

Answer:

As you move across a period the electrons are being added to the same shell. But, protons are being added as well. This makes the nucleus more positively charged and, increasing protons has a greater effect than electrons. So, there is a greater nuclear attraction and, because the electrons are being added to the same shell that shell gets pulled in more. This causes a decrease in atomic radius.

Explanation:

5 0
3 years ago
Science plz help due soon 6th grade Major grade
pentagon [3]

Answer:

the answer is d.

Explanation:

because the core is deepest then is the mantle and the lithpsphere is last .

I put a picture incase you need a visual example.

5 0
2 years ago
Why is the cloning of Dolly the sheep important to humans? Animals that produce human medicines could be cloned. Cloned animals
a_sh-v [17]

Answer:

C. better meat

Explanation:

Farmers always are looking to better their stock to possibly increase milk production or increase the meat quality.

5 0
2 years ago
Read 2 more answers
8. Given the balanced chemical equation Br2 + 2 NaI -> 2 NaBr + I2 How many moles of sodium bromide (NaBr) could be produced
bezimeni [28]

Since we are already given the balanced equation:


Br_{2}+2NaI → NaBr+I_{2}


We can derive the molar ratios as: 1:2:1:1


That being said, we are given 0.172 moles of bromine (Br_{2}), so it has a ratio of 1:1 with sodium bromide (NaBr).


So we can take from that ratio, that when 0.172 moles of bromine are used, we are, in turn, going to get 0.172 moles of sodium bromide produced.

4 0
3 years ago
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