Percent Error, moles, percent comp, molecular formula Honors

Front

What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g?

Back

K8S4O16

Front

How many oxygen atoms are there in one formula unit of Zn(NO3)2?

Back

6

Front

How many nitrogen atoms are there in one formula unit of Zn(NO3)2?

Back

2

Front

What is the percent composition of Benzene, C6H6?

Back

C = 92.2%, H = 7.8%

Front

What would be the mass of 1.5mol H2O?

Back

27g

Front

Define percent error in measurements.

Back

Percent error is the difference between the measured value and the true value, divided by the true value, multiplied by 100.

Front

What is the formula to calculate percent composition of an element in a compound?

Back

(mass of element in 1 mole of compound / molar mass of compound) x 100

Front

How do you determine the empirical formula from percent composition?

Back

Convert percent to grams, divide by molar mass to find moles, and simplify the ratio.

Front

What is the relationship between moles and mass?

Back

Moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of water (H2O)?

Back

18 g/mol.