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KATRIN_1 [288]
4 years ago
9

What symbol is that plz tell

Chemistry
2 answers:
suter [353]4 years ago
8 0
Its an x if u r trying 2 solve an equation
aalyn [17]4 years ago
3 0
It means harmful all these symbols are science safety symbols
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15. Why are the coefficients important in a balanced chemical equation- other than the fact that they are used to balance the eq
lara [203]
The coefficients in a balanced chemical equation are important because they give the ratio of the reactants and the products.

Those ratios are fixed and when the reagents react do it in the same proportion and yield the products  in the same proportion of the coefficients.

Then, the coefficients are the basis for the calculations of  the amount of substances that react and the amount of substances that are formed as result of the reaction.
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4 years ago
In each pair of compounds, pick the one with the vapor pressure at a given temperature. explain your reasoning.
Soloha48 [4]
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For the reaction PCl5(g) + heat PCl3(g) + Cl2(g), what will happen when the temperature is decreased
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How many grams of glucose (C6H12O6) are contained in 555 mL of a 1.77 M glucose solution?
ANTONII [103]
Molarity =wt/M.wt * 1000/V

=> 1.77 = wt/180 * 1000/555

> wt = 1.77 * 180*555 /1000 = 176.823 g
4 0
2 years ago
Linolenic acid (C18H30O2 - M.W. = 278.42 g/mol) reacts with hydrogen gas according to the equation: C18H30O2 + 3H2 (g) → C18H36O
Ludmilka [50]

Answer:

2.53 L is the volume of H₂ needed

Explanation:

The reaction is: C₁₈H₃₀O₂ + 3H₂ → C₁₈H₃₆O₂

By the way we can say, that 1 mol of linolenic acid reacts with 3 moles of oxygen in order to produce, 1 mol of stearic acid.

By stoichiometry, ratio is 1:3

Let's convert the mass of the linolenic acid to moles:

10.5 g . 1 mol / 278.42 g  = 0.0377 moles

We apply a rule of three:

1 mol of linolenic acid needs 3 moles of H₂ to react

Then, 0.0377 moles will react with (0.0377 . 3 )/1 = 0.113 moles of hydrogen

We apply the Ideal Gases Law to find out the volume (condition of measure are STP) → P . V = n . R . T → V = ( n . R .T ) / P

V = (0.113 mol . 0.082 L.atm/mol.K . 273.15K) 1 atm = 2.53 L

4 0
3 years ago
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