Chemistry, Ch 10, Chemical Quantities, Pre Assessment

Regarding Avogadro’s number and the mole, which of the following statements is TRUE?

• There are 12 atoms of carbon in 6.02 x 10²³ grams of carbon.

• There are 6.02 x 10²³ grams of carbon in one mole of carbon

• There are 12 atoms of carbon in 1 mole of carbon

• There are 6.02 x 10²³ atoms of carbon in 12 grams of carbon

Relating moles and particles, which of the following statements is most TRUE?

• 1 mole of chlorine has more particles than 1 mole of oxygen

• 1 mole of chlorine has fewer particles than 1 mole of oxygen

• 1 mole of chlorine has the same number of particles as 1 mole of oxygen

• There is no direct relationship between moles and number of particles

Convert 0.00037 grams to correct scientific notation

• 37 x 10^-4 grams

• 37 x 10⁴ grams

• 3.7 x 10^-4 grams

• 3.7 x 10⁴ grams

What is the molar mass of tungsten (W)?

• 183.84 grams per mole

• 183.84 grams per atom

• 183.84 moles per gram

• Both “a” and “b” are correct

What is the molar mass of the compound CaBr₂?

• 119.98 g/mole

• 160.06 g/mole

• 199.88 g/mole

• 239.96 g/mole

Convert 8.00 moles of sodium chloride to grams of sodium chloride.

• 7.30 grams

• 467.52 grams

• 0.137 grams

• 467.52 moles

How many molecules are in 18.0 moles of carbon dioxide?

• 1.12 x 10²⁸ molecules

• 5.34 x 10²² molecules

• 1.08 x 10²⁵ molecules

• 3.34 x 10²² molecules

How many molecules are in 3.6 grams of NaCl?

• 0.06 molecules

• 1.0 x 10²¹ molecules

• 1.3 x 10²⁶ molecules

• 3.7 x 10²² molecules

What is the mass of 1.0 x 10⁶ atoms of Platinum (Pt)?

• 190 grams

• 3.2 x 10^-16 grams

• 3.2 x 10¹⁶ grams

• 8.5 x 10^-21 grams

Mole ratios for a reaction come from the ____

• coefficients in a balanced chemical equation

• molar mass of each substance

• periodic table

• total mass of the products