# 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? |
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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? |
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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)? |
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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? |
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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? |
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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? |
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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? |
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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)? |
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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... |
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a) furry animal | b) a conversion factor | c) used in english class | d) equals 1000 things | |

What is the molar mass of Re? |
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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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