You need to scale up from the mass of iron ions to the mass of the compound FeSO 4. A baking powder mixture contains sodium hydrogencarbonate, NaHCO 3. Calculate the minimum percentage of sodium hydrogen carbonate that should be in the mixture. You need to scale up from the formula masses of the carbonate ion and that of sodium hydrogen carbonate. In an experiment 6. Apart from the mass of the crucible, the final mass of the residue was The oxide O formed was an essential ingredient in a ceramic pigment mixture P for glazing pottery.

What mass of the oxide O is needed to make 12 g of the mixture P? Scaling up gives 3.

## Molar Mass - Chemistry Test Questions

Above is typical periodic table used in GCSE science-chemistry specifications in doing chemical calculations, and I've 'usually' used these values in my exemplar calculations to cover most syllabuses. What is relative atomic mass? In each of these examples, a mass unit is multiplied by a velocity unit to provide a momentum unit. This is consistent with the equation for momentum. Momentum is a vector quantity.

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As discussed in an earlier unit, a vector quantity is a quantity that is fully described by both magnitude and direction. The direction of the momentum vector is the same as the direction of the velocity of the ball.

### Using Mass Percent in Calculations

In a previous unit, it was said that the direction of the velocity vector is the same as the direction that an object is moving. As a vector quantity, the momentum of an object is fully described by both magnitude and direction. From the definition of momentum, it becomes obvious that an object has a large momentum if both its mass and its velocity are large.

Both variables are of equal importance in determining the momentum of an object. Consider a Mack truck and a roller skate moving down the street at the same speed. The considerably greater mass of the Mack truck gives it a considerably greater momentum. Yet if the Mack truck were at rest, then the momentum of the least massive roller skate would be the greatest. The momentum of any object that is at rest is 0.

Objects at rest do not have momentum - they do not have any " mass in motion. The momentum equation can help us to think about how a change in one of the two variables might affect the momentum of an object. Consider a 0.

Given that relative abundance implies that all values are relative to each other, how can all of the relative abundances sum to a number that is greater than ? It is this normalized value that adds up to Sign up to join this community.

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The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. In a mass spectrum, how can the sum of relative abundances be greater than ?

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