What do we call the force of resistance that makes a rolling ball stop

Friction

Explanation:

Friction is a force that resists movement. It always opposes the motion of an object.

3.2 × 10² g

Explanation:

Step 1: Given data

Moles of nitrous acid: 6.9 mol

Step 2: Calculate the molar mass of nitrous acid

The molar mass of a compound is equal to the sum of the molar masses of the elements that form it times their atomicities.

M(HNO₂) = M(H) × 1 + M(N) × 1 + M(O) × 2

M(HNO₂) = 1.01 g/mol × 1 + 14.01 g/mol × 1 + 16.00 g/mol × 2

M(HNO₂) = 47.02 g/mol

Step 3: Calculate the mass corresponding to 6.9 moles of nitrous acid

6.9 mol × 47.02 g/mol = 3.2 × 10² g