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# Chemistry

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Cards in this guide (23)
How many moles of magnesium oxide are formed when 4 moles of magnesium react with oxygen

Four (4) moles of magnesium oxide are formed when 4 moles of magnesium react with oxygen.

If 2 moles of sodium carbonate are used in the reaction how many grams of sodium chloride will be formed

234 grams

The correct value for the universal gas constant is

Values of general gas constant are: (value dependant on units)

R = 0.08205746 [atm. ℓ.mol-1.K-1]

R = 8.314472 [Pa.m3.mol-1.K-1 or J.mol-1.K-1]

R = 1.99 [Cal.mol-1.K-1]

An increase in gas pressure is a result of an increase in molecular collisions

ture

Sodium will react with oxygen to form sodium oxide Use the formula below to determine how many grams of sodium oxide will be formed if 46 grams of sodium are used in the reaction

62 grams a+

The ideal gas law measures pressure in

atmospheres A+

In the ideal gas law n represents

moles of gas particles

Sophie was asked to distinguish gases from solids and liquids Which of the following answers would be most correct

Gases are the least dense, have the greatest particle energy, and have no specific shape.

How many grams of water will be needed to produce 1.5 moles of acetylene gas

54 grams

(:

As the temperature of a gas increases the volume of the gas must also increase to maintain constant pressure

That is correct. it's called Charles's law. it shows the connection between a gases temperature and its volume. in order to maintain constant pressure you must increase the volume of the container holding the gas if you increase the temperature of the gas.

What term is defined as the number of moles of solute divided by the number of liters of solution

Molarity, abbrev. M, units: mol/L, mmol/ml

An unknown sample with a molecular mass of 180.0g is analyzed to yield 40 percent C 6.7 percent H and 53.3 percent O What is the empirical formula and the molecular formula of this compound

ch2o and c6h12o6

A compound is found be 36.5 percent Na 25.3 percent S and 38.0 percent O What is its empirical formula

Na2SO3, Sodium Sulfite.

The elements in an imaginary compound exist in the mole ratio of 1 3 1 for elements XY What will the empirical formula for the compound be

X4y3

What is the best definition of manometer

an instrument that is used to measure gas in a closed container. A+

Pressure is used to increase the volume of gas

Pressure is used to increase the volume of gas in Boyle's law.

Calculate the empirical formula of a compound formed from 3 percent C 0.3 percent H and 96.7 percent you Which formula below correctly represents the empirical formula

Chi a+

A compound formed of 0.059 mol hydrogen and 0.94 mol oxygen has a molecular mass of 34.0 gmole What is the molecular formula of this compound

h2o2

Choose the product metal oxide plus nonmetal oxide æ

metal hydroxide

What is the empirical formula for the molecular formula C9H15O3

C9h15o3/3=c3h5o

A compound found to contain 75.7 arsenic and 24.3 oxygen would have which of the empirical formulas below

As2O3

From this reaction 127.1 grams of copper will produce how many grams of silver

431.5 grams

Choose the best definition of STP

a term that indicates a combined measurement of standard atmospheric pressure and room temperature. A+

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