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deff fn [24]
3 years ago
6

An Olympic medal contains 71.5% of gold by mass. How much gold could be extracted from a medal that weighs 115 grams? 1. 82.2 mo

l 2. 0.817 mol 3. 0.417 mol 4. 31.7 mol 5. 14.1 mol 6. 1.33 mol
Chemistry
1 answer:
worty [1.4K]3 years ago
7 0

Answer:

0.417 mol could be extracted from a medal that weighs 115 grams

Explanation:

Our Olympic medal weighs 115 g and we know that 71.5% is gold so how much from this medal is gold?

100 % ____ 115 g

71,5 % ____ 82.22 g

Molar mass of Au is 196.97 g/m

Mass / Molar mass = Moles

82.22 g / 196.97 g/m = 0.417 moles

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. Use the following reaction to determine how much of each product would be released if 42 000 kg (42 tonnes) of methyl isocyana
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The amount of 1,3-dimethyl urea produced would be 32,458 grams or 32.458 kg while that of carbon dioxide would be 16,214 grams of 16.214 kg

<h3>Stoichiometric problem</h3>

From the equation of the reaction, the mole ratio of methyl isocyanate with the products is 2:1 respectively.

Mole of 42,000 kg of methyl isocyanate = 42000/57 = 736.84 moles

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More on stoichiometric problems can be found here: brainly.com/question/14465605

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In order to make 0.500 L of a 0.475 M solution, you will need to weigh out how many grams of sucrose (MM = 342 g/mol)?
elixir [45]

The first step to solve this problem is to multiply the volume of solution times its concentration to find the number of moles needed, remember that M=mol/L:

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Now, use the molar mass of sucrose to find the number of grams needed to make the solution. This is, multiply the number of moles needed times the molar mass:

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It means that to make 0.500L of a 0.475M you will have to weigh 81.225g of sucrose.

4 0
1 year ago
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