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3 years ago

1. A baseball pitcher won 75% of the games he pitched. If he pitched 43 ballgames, how many games

Chemistry

1 answer:

kow [346]3 years ago

8 0

Answer:

He won 32 games.

Explanation:

<em>Another way of expressing 75% is 75/100.</em>

To calculate how many games the baseball pitcher won, we <u>multiply the total of games played</u> (43, in this case) by the percent won:

43 * 75/100 = 32.25 ≅ 32

So the baseball pitcher won 32 games.

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If the change of enthalpy of this reaction when proceeding left to right is +14 kcal, which chemical equation is correct?

bagirrra123 [75]

Answer:

N₂O₄ + 14 kcal ⇄ 2NO₂.

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Since the sign of ΔH determines either the reaction is exothermic or endothermic:

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3 years ago

A certain element X has four isotopes. 5.845% of X has a mass of 53.93961 amu. 91.75% of X has a mass of 55.93494 amu. 2.123% of

Akimi4 [234]

Answer:

Average atomic mass of element X is 56.19 amu

Explanation:

Given:

Four isotopes of X:

5.845% of X has a mass of 53.93961 amu.

91.75% of X has a mass of 55.93494 amu.

2.123% of X has a mass of 56.93539 amu.

0.2820% of X has a mass of 57.93328 amu.

To find: average atomic mass of element X

Solution:

Isotopes are variants of a particular chemical element such that they have the same number of protons but different number of neutrons.

Average atomic mass of element X = $\frac{53.93961+55.93494+56.93539+57.93328}{4}=\frac{224.74322}{4}=56.185805\approx 56.19$

So, the average atomic mass of element X is 56.19 amu.

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3 years ago