# 9.2 Two-step Conversions Retake!: Question Preview (ID: 13734)

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**A clown needs 4.5 x 10^15 particles of Helium (He). How many grams of helium does he need?**

a) 5.12 x 10^38 grams of He

b) 5.12 x 10^38 grams of He

c) 2.99 x 10^-8 particles of He

d) 2.99 x 10^-8 grams of He

**How many FeO particles are there in 21g of FeO?**

a) 12 grams

b) 1.76 x 10^23 particles of FeO

c) 6.02 x 10^23 particles of FeO

d) 4.5 x 10^12 grams of FeO

**How many atoms are in 10.5 grams of Chlorine gas (Cl)?**

a) 1.8 x 10^23 atoms

b) 2.8 x 10^15 atoms

c) 10.3 x 10^19 grams

d) 4.3 x 10^21 grams

**How many atoms are in 12.2 grams of CO2?**

a) 1.66 x 10^23 particles

b) 2.23 x 10^12

c) 1.56 x 10^12

d) 2.43 x 10^42

**How many atoms are in 1.2 grams of Ca?**

a) 5.9 x 10^14 atoms

b) .18 x 10^23 atoms

c) 1.5 x 10^45 atoms

d) 2.9 x 10^12 atoms

**What is the molar mass of CaO?**

a) 45.12 grams/1 mole of CaO

b) 34.12 grams/ 1 moles of CaO

c) 56.06 grams/ 1 mole of CaO

d) 90.10 grams/ 1 mole of CaO

**You discovered an unknown metal. It is either K, Co, or Cu. 1 mole of the metal is weighed at 58.93 grams. What is the metal?**

a) None of the metals

b) K

c) Co

d) Cu

**How many grams are in 2.4 x 10^15 atoms of Helium (He)?**

a) 12.4 grams

b) 2.98 x 10^45 grams

c) 2.59 x 10^38 grams

d) 1.59 x 10^-8 grams

**The mole is a...**

a) furry animal

b) a conversion factor

c) used in english class

d) equals 1000 things

**What is the molar mass of Re?**

a) 186.21 grams/ 1 mole of Re

b) 202.1 grams/ 1 mole of Re

c) 108.3 grams/ 1 mole of Re

d) 109.5 grams/ 1 mole of Re

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