- Do lanthanides have a group(horizontal) number??

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What is the daily cost of a NASA Mars rover? The difference between two nubers is less than 96. The larger number is 245. Find the smaller number? A2.80L vessel contains3.42g of a gas at1.00atm and27.0°C.Calculatethe density of thegas in grams perliter.What is the molar mass of the gas? What is the mass of a lead sinker with a volume of 8 cm3? How many moles of Ca(OH)2 are in 1.20 kg of Ca(OH)2?
Answer in units of mol.?