Question

How many moles are there in 237 g of niobium? Round to the nearest tenth. Don't forget the units.

Answer 1

Answer: The number of moles of given amount of niobium is 2.6 moles

Step-by-step explanation:

To calculate the number of moles, we use the equation:

`\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}`

We are given:

Given mass of niobium = 237 g

Molar mass of niobium = 93 g/mol

Putting values in above equation, we get:

`\text{Moles of niobium}=(237g)/(93g/mol)=2.55mol`

Hence, the number of moles of given amount of niobium is 2.6 moles

Answer 2

Given :

Mass of niobium (Nb) = 237 g

To determine:

The Number of moles of niobium in the given mass

Step-by-step explanation:

In chemistry, moles (n) is a unit of measurement which is given by the ratio of the mass of the substance (m) to its atomic or molar mass (M)

i.e. n = 'm' in grams/ 'M' in grams.mole⁻¹

The atomic mass of Nb = 94 g/mol

Thus,

n = 237 g/ 94 g.mol⁻¹ = 2.521 moles

Ans: Number of moles of Nb rounded off to the nearest tenth is 2.5 moles