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laila [671]
3 years ago
14

Calculate the grams of calcium present in 70 grams of calcium chloride.

Chemistry
1 answer:
Dmitry_Shevchenko [17]3 years ago
4 0

Answer:

37.1g of Ca

Explanation:

Hello,

Molecular formula for calcium chloride = CaCl

Molar mass = 40 + 35.5 = 75.5g/mol

Assuming there's one mole of CaCl

1 mole = mass / molar mass

Mass = 1 × 75.5

Mass = 75.5g

75.5g of CaCl contains 40g of Calcium

70g of CaCl will contain x g of Calcium

X = (70 × 40) / 75.5

X = 37.086g

Therefore, 70g of CaCl contains approximately 37.1g of Ca

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One of these notations represents the definition of one mole. That is
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Answer:

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Explanation:

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3 years ago
A 25.0-mL sample of 0.150 M hydrazoic acid, HN3, is titrated with a 0.150 M NaOH solution. What is the pH after 13.3 mL of base
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Answer:

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Explanation:

Given that:

the volume of HN₃ = 25 mL = 0.025 L

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the volume of NaOH = 13.3 mL = 0.0133

number of moles of NaOH = 0.0133× 0.150

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The chemical equation for the reaction of this process can be written as:

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thus the new number of moles of HN₃ = 0.00375 - 0.001995 = 0.001755 mol

Total volume used in the reaction =  0.025 +  0.0133 = 0.0383  L

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