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zmey [24]
3 years ago
13

What is the volume of a 200. gram sample of gold if its density is known to be 20.5 g/cm3?

Chemistry
1 answer:
Travka [436]3 years ago
3 0

The volume  of  a  200 g sample  of  gold    is   9.76  cm³

<u><em> calculation</em></u>

  volume = mass /density

mass =  200 g

volume = 20.5 g/Cm³

volume  is therefore = 200g / 20.5 g/cm³  = 9.76 cm³


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How many grams of Mg are needed to produce 224 g of MgO in the complete reaction of Mg
zmey [24]

Answer:

134.4 g of Mg

Explanation:

reaction:

2Mg + O2 ➡️ 2MgO

1) find the mol of MgO

mol = mass / molar mass

mass = 224 g

molar mass = 24+16 = 40

mol = 224 / 40

= 5.6 moles

2 mol = 5.6 moles

2) find the mass of Mg

mass = mol × molar mass

mol = 5.6

molar mass = 24

mass = 5.6 × 24

= 134.4 g

7 0
3 years ago
A sample of an ideal gas at 1.00 atm and a volume of 1.32 L was placed in a weighted balloon and dropped into the ocean. As the
Amiraneli [1.4K]

Answer:

When the pressure increases to 90.0 atm , the volume of the sample is 0.01467L

Explanation:

To answer the question, we note that

P₁ = 1.00 atm

V₁ = 1.32 L

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According to Boyle's law, at constant temperature, the volume of gas is inversely proportional to its pressure

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Solving the above equation for V₂ we have

V_2 = \frac{P_1P_2}{P_2}  that is V₂ = \frac{1atm*1.32L}{90atm} = \frac{11}{750}L or 0.01467L

5 0
3 years ago
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Where 760 mm is the height of Mercury for 1 atm.

For 0.900 atm,

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