percent mass composition
A chemist determines that 1.26g of iron reacts with 0.54g of oxygen to form rust. what is the percent composition of each element in the new compound?
What are 70% Fe, 30% O?
_ K + _B2O3 --> _K2O + _ B
What are 6, 1, 3, 2?
How many moles of magnesium is equivalent to 3.01 x 10^22 atoms of magnesium?
What is 0.0500 mol Mg?
In ____ reactions, two or more substances react to form one product.
What is combination/synthesis?
Avogadro's number
What is 6.022 x 10^23?
In an experiment, a student took a 12.2 g sample of table salt and chemically separated the chlorine from the sodium. He determined that there was 5.2g of chlorine in the sample. What is the percent composition of each element in the table salt?
What are 43% Cl, 57% Na?
_Na + _NaNO3 --> _Na2O + _N2
What are 10, 2, 6, 1?
How many atoms are in 0.750 moles of zinc?
What is 4.52 x 10^23 atoms Zn?
In combustion reactions, hydrocarbons react with oxygen in the air to form ____ and ____.
What are H2O and CO2?
A compound contains 1.2 moles of carbon and 3.2 moles of hydrogen. What is the percent composition by mass of each element in the compound?
What are 82% C and 18%H?
What is the percent composition by mass for each element in carbon monoxide?
What are 42.8% C, 57.1% O?
_NaOH + _H2CO3 --> _Na2CO3 + H2O
What are 2, 3, 1, 6?
How many moles are in 28.0 grams of CO?
What is 0.636 mol CO2?
3 types of reactions.
What are decomposition, combination/synthesis/composition, and combustion reactions?
_Ca3(PO4)2 + _SiO2 + _C --> _CaSiO3 + _CO + _P
What are 1, 3, 5, 3, 5, 2?
What is the percent composition by mass for each element in sodium phosphate?
What are 42.07% Na, 18.9% P, 39.02% O?
What are 2, 3, 1, 6?
How many moles of gaseous argon atoms are present in 11.2 L at STP?
What is 0.500 mol Ar?
A balanced chemical equation tells us the ratio of ____ of each molecule. (eg. 2H2 + O2 --> 2H2O tells us that the ratio of ____ between O2 and H2O is 1:2)
What is moles?
In an experiment, 2.0 moles of oxygen atoms reacts with 80.1 g of calcium to form a new compound. What is the percent composition by mass of each element in the new compound?
What are 71.45% Ca, 28.54% O?
What is the percent composition by mass for each element in ammonium sulfate (NH4)2SO4 ?
What are 21.21% N, 6.06% H, 24.24% S, 48.48% O?
_CH3CH2CH2CH3 + _O2 --> _CO2 + _ H2O
What are 2, 13, 8, 10?
Find mass (grams) of 1.00 x 10^23 molecules of sodium iodide.
What is 24.99g NaI?
____ formulas tell you how many atoms of each element are in a compound (eg. H2O2) and ____ formulas tell you the simplest or most reduced ratio of elements in a compound (eg. HO).
What are molecular and empirical?
How many molecules are present in 5.00 mg of aspartame (C14H18N2O5)?
What is 1.02 x 10^19 molecules?