2.50 G Cucl2 Equals Moles
Question: A sample of carbon-12 has a mass of 6.00 g. How many atoms of carbon-12 are in the sample?
3.01 × 1023
6.02 × 1023
1.20 × 1024
3.60 × 1024
How many moles of carbon are in the sample?
0.500
1.00
6.00
12.0
Answer: 3.01 x 10^23
.500
Question: The molar mass of copper(II) chloride (CuCl2) is 134.45 g/mol. How many formula units of CuCl2 are present in 17.6 g of CuCl2?
7.88 × 1022 formula units
1.84 × 1023 formula units
1.91 × 1023 formula units
1.42 × 1024 formula units
Answer: 7.88 x 10^22 formula units
Question: To calculate molar mass
Answer: find the number of grams in each elements, find the number of grams of each element in one mole, and add together
Question: The molar mass of barium nitrate (Ba(NO3)2) is 261.35 g/mol. What is the mass of 5.30 × 1022 formula units of Ba(NO3)2?
0.0900 g
12.0 g
23.0 g
3,130 g
Answer: 23.0g
Question: A gas cylinder contains exactly 15 moles of oxygen gas (O2). How many molecules of oxygen are in the cylinder?
4.01 × 1022 molecules
6.02 × 1023 molecules
9.03 × 1024 molecules
2.89 × 1026 molecules
Answer: 9.03 x 10^24