Science Quiz / Amount of Substance Quiz

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QuestionsAnswersExtra info
Empirical Formula of 60% Carbon, 30% Hydrogen and 10% Oxygen?
The Mr of the compound is 480. What is the molecular formula?
What is the relative atomic mass of Osmium?1 Decimal Place.
What is the ideal gas equation?
If the pressure is 10KPa, the volume is 30m3 and the temperature is 100'C, what is the number of moles?3 Significant Figures.
Balance the equation. Al2Se3 + H2O = Al(OH)3 + H2Se.Replace the arrow with =.
Mg(s) + 2HNO3(aq) →Mg(NO3)2(aq) + H2(g). A 0.0732 g sample of magnesium was added to 36.4 cm3 of 0.265 mol dm–3 nitric acid. The acid was in excess. Calculate the amount, in mo3 Significant Figures. Not standard form.
What is the percentage atom economy of C2H2 in the equation CaC2 + 2H2O-->Ca(OH)2 + C2H2?3 Significant Figures.
A reaction between solid sulphur and oxygen produces sulphur dioxide. The reaction started with 384 grams of S6 (s) in an excess of oxygen. What is the percent yield if only 680 gr3 Significant Figures. S6 + 6O2 --> 6SO2
Balance the equation C2H6 + O2 --> CO2 + H2OReplace the arrow with =.

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