Answer:
![\boxed {\boxed {\sf 0.055 \ mol \ CO_2}}](https://tex.z-dn.net/?f=%5Cboxed%20%7B%5Cboxed%20%7B%5Csf%200.055%20%5C%20mol%20%5C%20CO_2%7D%7D)
Explanation:
To convert form grams to moles, the molar mass must be used. This is the mass (in grams) in 1 mole of a substance.
We can use the values on the Periodic Table. First, find the molar masses of the individual elements: carbon and oxygen.
- C: 12.011 g/mol
- O: 15.999 g/mol
Check for subscripts. The subscript of 2 after O means there are 2 oxygen atoms, so we have to multiply oxygen's molar mass by 2 before adding.
- O₂: 2* (15.999 g/mol)=31.998 g/mol
- CO₂: 12.011 g/mol + 31.998 g/mol =40.009 g/mol
Use the molar mass as a ratio.
![\frac {44.009 \ g\ CO_2}{ 1 \ mol \ CO_2}](https://tex.z-dn.net/?f=%5Cfrac%20%7B44.009%20%5C%20g%5C%20CO_2%7D%7B%201%20%5C%20mol%20%5C%20CO_2%7D)
Multiply by the given number of grams.
![2.4 \ g \ CO_2 *\frac {44.009 \ g\ CO_2}{ 1 \ mol \ CO_2}](https://tex.z-dn.net/?f=2.4%20%5C%20g%20%5C%20CO_2%20%2A%5Cfrac%20%7B44.009%20%5C%20g%5C%20CO_2%7D%7B%201%20%5C%20mol%20%5C%20CO_2%7D)
Flip the fraction so the grams of carbon dioxide cancel.
![2.4 \ g \ CO_2 *\frac { 1 \ mol \ CO_2}{44.009 \ g\ CO_2}](https://tex.z-dn.net/?f=2.4%20%5C%20g%20%5C%20CO_2%20%2A%5Cfrac%20%7B%201%20%5C%20mol%20%5C%20CO_2%7D%7B44.009%20%5C%20g%5C%20CO_2%7D)
![2.4 *\frac { 1 \ mol \ CO_2}{44.009}](https://tex.z-dn.net/?f=2.4%20%20%2A%5Cfrac%20%7B%201%20%5C%20mol%20%5C%20CO_2%7D%7B44.009%7D)
![\frac { 2.4 \ mol \ CO_2}{44.009}= 0.0545342998 \ mol \ CO_2](https://tex.z-dn.net/?f=%5Cfrac%20%7B%202.4%20%5C%20mol%20%5C%20CO_2%7D%7B44.009%7D%3D%200.0545342998%20%5C%20mol%20%5C%20CO_2)
The original measurement of grams has 2 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place.
The ten thousandth place has a 5, so we round the 4 to a 5.
![0.055 \ mol \ CO_2](https://tex.z-dn.net/?f=0.055%20%5C%20mol%20%5C%20CO_2)
2.4 grams of carbon dioxide is about 0.055 moles.
Answer:
The answer is A.
Explanation:
Scientists repeat the same experiments because they wanna try to see if they keep getting the same result. When a scientific investigation is repeated, this is called replication. Replication is important in science so scientists can “check their work.” The result of an experiment is not likely to be well accepted unless the investigation is repeated many times and the same result is always obtained.
The speed is 7,350km that's the speed of the car
Answer:
The amount of mass and matter in all the transformations of the clay ball will remain the same or constant
Explanation:
From the law of conservation of mass we have, for an enclosed system to and from which there is no transfer of matter or energy, mass cannot be created nor destroyed, and remains constant at the given value, but the matter which make up the mass can be changed into different forms
Therefore, the clay ball can be transformed into different shapes and will still posses the same initial mass before the transformation, provided there are no transfer of matter or energy from the clay ball system.