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Delvig [45]
3 years ago
8

Calvin is practicing for a golf tournament. His normal driver distance is 250 yards. He hits three balls with his driver, and th

ey travel a distance of 270 yards, 273 yards, and 269 yards. Which of the following is true?
Chemistry
1 answer:
Oduvanchick [21]3 years ago
3 0

Answer:

This question is incomplete as it lacks options; the options are:

A. His drives are both accurate and precise

B. His drives are precise but not accurate

C. His drives are accurate but not precise

D. His drives are neither accurate nor precise

The correct answer is B. His drives are precise but not accurate

Explanation:

The accuracy of a measurement refers to how close those measurements are to a true or accepted value. Note that, in this case, the normal driver distance of 250 yards is the TRUE OR ACCEPTED VALUE. Observing the three measured values for the driver's distance; 270 yards, 273 yards, and 269 yards, one would notice that these values are far apart from the true value of 250yards. Hence, these measurements are NOT ACCURATE.

On the other hand, PRECISION refers to how close measurements are to one another. In this case, 270yards, 273 yards, 269 yards are close to one another, hence that are said to be PRECISE.

Therefore, according to the measurements, it can be said that HIS DRIVES ARE PRECISE BUT NOT ACCURATE

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Explanation:

The balanced chemical equation is:

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According to stoichiometry :

3 moles of Mn is produced by = 3 moles of MnO_2

Thus 20.4 moles of Mn is produced by =\frac{3}{3}\times 20.4=20.4moles  of MnO_2

Mass of MnO_2=moles\times {\text {Molar mass}}=20.4moles\times 86.9g/mol=1773g=1.773kg    (1kg=1000g)

Thus 1.77 kg of manganese (IV) oxide reacts to produce 1.12kg of manganese metal.

6 0
3 years ago
What does the formula H2O mean
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