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Chemistry

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Vern Kovacek

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โˆ™ 2021-09-30 20:41:41
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Cards in this guide (20)
What are elements and compounds in states of matter

Chemical elements are solids, liquids or gases. Compounds are also solids, liquids or gases.

What is true about the molar mass of chlorine gas

The Molar Mass is 71.0 g

If 60.2 grams of Hg combines completely with 24.0 grams of Br to form a compound what is the percent composition of Hg in the compound

71.5 %

What information is needed to calculate the percent composition of a compound

The formula of the compound and the atomic mass of its elements.

The atomic masses of any two elements contain the same number of

no its ions

Which expression represents the percent by mass of nitrogen in NH4NO3

28 g N/80 g NH4NO3 *100

The ratio of carbon atoms to hydrogen atoms to oxygen atoms in a molecule of dicyclohexyl maleate is 4 to 6 to 1 What is its molecular formula if its molar mass is 280 g

C16h24o4

Avogadros number of representative particles is equal to one

Avogadro's number of any particles or countable objects, equals by definition 1 (exact) mole.

Which of the following compounds has the lowest percent gold content by weight A AuOH B AuOH3 C AuCl3 D AuI3

A. AuOH lol not even close defiantly AuI3 100% sure

What is the volume in liters of 0.500 mol of c3h8 gas at stp

Its about 11.2 L :)

What is the number of moles in 500 L of He gas at STP

22 mol

If the density of a noble gas is 1.783 gL at STP that gas is

Ar

(argon)

To determine the formula of a new substance one of the first steps is to find the

Percent composition.

What is the number of moles in 9.63 L of H2S gas at STP

.430 mol

What does the molar mass of C7H16 and the molar mass of CaCO3 have the same number of

342.3

What gas samples would have the largest number of representative particles at STP

12.0 L He

What is the number of moles for 27.50 grams of CaCO3

Approximally 0.275 moles.

The molar mass of Ca C O3 is ~ 40+12+3*16 = 100g/mol

27.50g = x mol *100g/mol

27.50g/(100g/mol) = x mol

0.275 g/(g/mol) = x mol

0.275 mol = x mol

What net ionic equation describes the reaction when these solutions are mixed

The net ionic equation that describes the reaction when these solutions are mixed is the net summation. This is the net ionic equation for the chemical reaction.

What is the percent composition composition of chromium in BaCrO4

20.5%

Which combination of temperature and pressure correctly describes standard temperature and pressure or STP

0°C and 101 kPa

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