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2 years ago

How many significant figures are in 0.003450?

Chemistry

1 answer:

Olenka [21]2 years ago

7 0

Answer:

Explanation:

Four significant figures

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If 20.0g of MgSO4⋅7H2O is thoroughly heated, what mass of anhydrous magnesium sulfate will remain?

alina1380 [7]

Answer: 9.8g

Explanation:

The calculation is based on the fact that all the water in the molecule will be removed.

i will, then, calculate the mass of water removed and then subtract it from the original 20.0 g of sample.

You can do that following these steps.

1) Calculate the number of moles of the hydrated magnsium sulfate, MgSO₄⋅7H₂O

number of moles = mass in grams / molar mass

The molar mass of MgSO₄⋅7H₂O is calcualted from the atomic mass of each atom times the number of atoms in the formula:

molar mass = 24.305 g/mol + 32.065 g/mol + 4×15.999g/mol + 7×2×1.008g/mol + 7×15.999 g/mol = 246.471 g/mol

⇒ moles of MgSO₄⋅7H₂O = 20.0g / 246.471 g/mol = 0.0811 moles

2) Calculate the number of moles of water, using the ratio from the chemical formula:

7 moles H₂O / 1 mol MgSO₄⋅7H₂O = x / 0.0811 mols MgSO₄⋅7H₂O

⇒ x = 0.0811 × 7 moles H₂O = 0.568 moles H₂O

3) Convert moles of H₂O to grams:

number of moles = mass in grams × molar mass = 0.568 moles × 18.015 g/mol = 10.2 g

4) Hence the mass remaining is 20.0g - 10.2g = 9.8g

5 0

3 years ago

Read 2 more answers

What is the answer to this question?

Hunter-Best [27]

I think it's 4 but I am not even 50% sure... But I think that is the answer..

5 0

3 years ago

What are the structural components of a triglyceride?

levacccp [35]

The structural components of a triglyceride is a molecule of glycerol and 3 fatty acids because one triglyceride is made up of glycerol that is made up of 3 different fatty acids.

Hope this helps!

3 0

3 years ago

How does the atomic radius increase?

Helen [10]

Answer:

increases as you move down a group as the number of electrons increases. Therefore, the atomic radius increases as the group and energy levels increase

Explanation:

5 0

3 years ago

The cycle repeats when the carbon stored in the atmosphere as carbon dioxide gas is taken in.

Rzqust [24]

Answer:

Order of the cycle:

Step -1>>>>Step -4 >>>> Step -3 >>>>> step -2.

Explanation:

Step -1:

Carbon dioxide is taken in by plants during photosynthesis.

Step -4;

The animal eats a plant and uses its carbohydrates for energy.

Step - 3

The animal releases the carbon dioxide back into the atmosphere during respiration.

Step -2

The cycle repeats when the carbon stored in the atmosphere as carbon dioxide gas is taken in.

Therefore, order of the cycle is Step -1>>>>Step -4 >>>> Step -3 >>>>> step -2.

5 0

3 years ago

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