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Jobisdone [24]
3 years ago
13

Why is hydrogen a light gas and iron is a heavy solid

Chemistry
2 answers:
lbvjy [14]3 years ago
8 0
<span>Heavier atoms make denser materials</span>
creativ13 [48]3 years ago
3 0
Because hydrogen is a gass nearly weightless and iron is a solid in which has a thicker mass.
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What is the mass sample of 0.0500 moles of zinc chloride ?
vlabodo [156]

Answer:

6.82g

0.59moles

Explanation:

1. What is the mass sample of 0.0500 moles of zinc chloride ?

Given parameters:

Number of moles ZnCl₂ = 0.05moles

Unknown:

Mass of the sample  =  ?

Solution:

To find the mass of a substance using the number of moles, it would be pertinent to understand what mole is.

A mole is a substance that contains the avogadro's number of particles.

It relates to the mass using the expression below;

                Mass of a substance  = number of moles x molar mass

Molar mass of  ZnCl₂;

        Atomic mass of Zn  = 65.4g/mol

                                   Cl = 35.5g/mol

Molar mass = 65.4 + 2(35.5)  = 136.4g/mole

Mass of a substance  = 0.05 x 136.4  = 6.82g

2. How many moles of potassium sulfide are in a 65.50g sample?

Given parameters:

Mass of K₂S  = 65.5g

Unknown:

Number of moles  = ?

Solution:

The number of moles of any substance is related to mass using the expression below;

              Number of moles  = \frac{mass}{molar mass}

Molar mass of K₂S  = 2(39) + 32  = 110g/mol

              Number of moles  = \frac{65.5}{110}   = 0.59moles

8 0
3 years ago
Please help. It's for chemistry
irinina [24]
What do i help with what
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Using the activity series provided. Which reactants will form products? Na &gt; Mg &gt; Al &gt; Mn &gt; Zn &gt; Cr &gt; Fe &gt;
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Answer:

Fe + Cu(NO3)2 →

Explanation:

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The answer is the second option.
8 0
3 years ago
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