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maw [93]
3 years ago
7

What is the mass of a steel cylinder that has a density of 75.0 g/ml and a volume of 12 ml?

Chemistry
1 answer:
liubo4ka [24]3 years ago
3 0
Density can be calculated using the following rule:
Density = mass / volume

Therefore:
mass = density * volume

We are given that:
Density = 75 g/ml
volume = 12 ml

Substitute with these givens in the equation to get the mass as follows:
mass = density * volume
mass = 75 * 12
mass = 900 g
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Water decomposes when electrolyzed to produce hydrogen and oxygen gas. If 2.5 grams of water were decomposed 1.04 grams of oxygen will be formed.

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2H_{2}O ⇒ H_{2} + O_{2}

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Number of moles of water = \frac{mass}{atomic mass of 1 mole}

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number of moles can be known by putting the values in the formula,

n = \frac{2.5}{18}

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2 moles of water gives one mole of oxygen on decomposition

so, 0.13 moles of water will give x moles of oxygen on decompsition

\frac{1}{2} = \frac{x}{0.13}

x = 0.065 moles of oxygen will be formed.

moles to gram will be calculated as

mass =number of moles x atomic mass

        = 0.065 x 16

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