Mistakes in Molar Mass Conversions

Which is the mistake in the given gram-to-mole unit conversion?

• The mass in grams of water

• The moles of water in the final answer

• The equation form of the molar mass of water

• The fractional form of the molar mass of water

• There is no mistake in the given gram-to-mole unit conversion.

Answer explanation

The equation form of the molar mass of water is [1 mol = 18.0 g] and NOT [1 mol = 20.0 g].

Which is the mistake in the given gram-to-mole unit conversion?

• The mass in grams of water

• The moles of water in the final answer

• The equation form of the molar mass of water

• The fractional form of the molar mass of water

• There is no mistake in the given gram-to-mole unit conversion.

Answer explanation

The final answer must be 10.00 mol H₂O since the given mass, 180.0 g, has 4 significant figures.

Tags

NGSS.HS-PS1-2

Which is the mistake in the given mole-to-gram unit conversion?

• The amount in moles of water

• The mass in grams in the final answer

• The equation form of the molar mass of water

• The fractional form of the molar mass of water

• There is no mistake in the given mole-to-gram unit conversion.

Answer explanation

The final mass in grams must have only 2 significant figures since the given number of moles, 2.0 mol, has 2 significant figures.

Tags

NGSS.HS-PS1-7

How many grams are there in 2.0 mol of water (H2O)? [1 mol = 18.0 g] Which is the mistake in the given mole-to-gram unit conversion?

• The amount in moles of water

• The mass in grams in the final answer

• The equation form of the molar mass of water

• The fractional form of the molar mass of water

• There is no mistake in the given mole-to-gram unit conversion.

Which of the following determines the correct number of significant figures in the final answer?

• Option 1: The significant figures in the molar mass

• Option 2: The significant figures in the given measurement

• Either Option 1 or Option 2

• Neither Option 1 nor Option 2