Mass and Moles calculations

*What is the moles of
1) BrI
when the mass is 26.2 mg
2) CF2Cl2
when the mass is 1.24 kg

*what is the mass of
1) CO2
when the moles are 0.0116
2) CO
when the moles are 0.0127

the steps with the results (^_^)

hey girl remember this equation;
no.of moles=mass/molar mass
so you just got to apply the given information and search for the unknown term

You need to calculate the molar mass of each compound, and the use the molar mass to convert mass to moles or moles to mass.

1. BrI has a molar mass of 80 + 127 = 207 g/mol. Now, convert your mass into grams:
26.2 mg X (1 g/1000 mg) = 0.0262 grams

Next divide the mass by the molar mass to give you moles:
0.0262 g / 207 g/mol = 1.27 X 10^-4 moles

The next one is just the same, but you will convert kg into grams.

For the others, the molar mass of CO2 is 12 + 2X16 = 44 g/mol
To convert moles to grams, just multiply by the molar mass:

0.0116 mol X 44 g/mol = 0.0.510 grams