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Nimfa-mama [501]
3 years ago
8

On a periodic table, element names are represented by: A. numbers B. chemical symbols C. pictures D. matter

Chemistry
2 answers:
MissTica3 years ago
5 0
Hello!

This must be a multiple choice question.

On a periodic table, every element is listed by it's element symbol and atomic number. For example, the atomic number and symbol for gold are 79 and Au. So, the answers are: A. Numbers and B. Chemical symbols.
kifflom [539]3 years ago
4 0
Elements on the periodic table are represented by chemical symbols.
Ex: O means Oxygen
Ex: Ag means Silver
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Calculate the amount in grams of Na2CO3 needed to react with HCL to produce 120g NaCl
worty [1.4K]
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
x = 1.027mol

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
m = nM
m = (1.027mol)(105.99g/mol)
m_{Na_2CO_3} = 108.85g

Hope this helps :)
6 0
3 years ago
How many mL of 0.200M KI would contain 0.0500 moles of KI? <br><br> Please explain and show work.
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Answer:

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Explanation:

call it V

V*0.2=0.05 (moles)

so V=0.05/0.2 = 0.25l = 250ml

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In chemistry, the molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles. It is the mass of 1 mole of the substance or 6.022×10²³ particles, expressed in grams.

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