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alexdok [17]
3 years ago
14

How many moles in 53g of palladium 216g of silver 46g of tungsten

Chemistry
2 answers:
Helga [31]3 years ago
7 0
To answer this, all you have to do is take the mass of the sample, in grams, and divide it by the atomic/molecular mass of the substance, in amu (atomic mass units)
So, here are my answers:
(i) 53g of Palladium = 53/106 = 0.5 moles
(ii) 216g of Silver = 216/108 = 2 moles
(iii) 46g of Tungsten = 46/184 = 0.25 moles

Hope I helped!! xx
snow_tiger [21]3 years ago
5 0
Moles = Mass / Mr 
You basically need to open the periodic table and divide the mass to find out the moles. 

Palladium = 53/ 106
                 = 0.5 moles

Silver = 216/108
          = 2 moles

Tungsten = 46/ 184
                = 0.25 moles
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2 years ago
Calculate the amount in grams of Na2CO3 needed to react with HCL to produce 120g NaCl
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Let's start off with the balanced chemical equation:

Na_2CO_{3_{(s)}} + \textbf2HCl_{_{(aq)}}\rightarrow CO_{2_{(g)}} + H_2O_{_{(l)}} + \textbf2NaCl_{_{(aq)}}

Assuming the sodium carbonate is the limiting reagent, look at the coefficients of sodium carbonate and sodium chloride and use those as a ratio of sodium carbonate to sodium chloride: 1:2.

Since you have the required mass of NaCl, convert this to moles.

Assuming you know how to find the molar mass of NaCl:

M_{NaCl} = 58.44g/mol
n = \frac{m}{M}
n_{NaCl} = \frac{120g}{58.44g/mol}
n_{NaCl} = 2.053mol

Using the ratio, since 1 mole of sodium carbonate is required to produce 2 moles of sodium chloride, cross-multiply the ratios:

1:2 = x:2.053mol
2x = 2.053mol
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Therefore 1.027 moles of sodium carbonate is required to produce the required amount of sodium chloride. Convert to mass for your final answer:

n_{Na_2CO_3} = 1.027mol
M_{Na_2CO_3} = 105.99g/mol
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m_{Na_2CO_3} = 108.85g

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3 years ago
A ball is dropped from a height of 20 feet onto a trampoline. When it hits the trampoline, it creates a 2-foot depression in the
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The trampoline's elastic potential energy is transformed into kinetic energy when it returns to its original position.
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3 years ago
A compound consists of only one type of element?
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Explanation:

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5 0
3 years ago
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