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8 days ago

What is the empirical formula of an oxide of chromium that is 48 percent oxygen by mass?

Mathematics

1 answer:

Svet_ta [4.3K]8 days ago

4 0

Answer:

CrO₃.

Step-by-step explanation:

First, we will find the chromium percentage in the oxide by using the following process:

Oxygen (O) = 48%

Chromium (Cr) =?

The oxide consists solely of chromium and oxygen, and its chromium percentage is calculated as:

Cr = 100 – percentage of oxygen

Cr = 100 – 48

Cr = 52%

Next, we will determine the empirical formula for the oxide:

Chromium (Cr) = 52%

Oxygen (O) = 48%

Now, we divide by their molar mass:

Cr = 52/52 = 1

O = 48/16 = 3

Now, divide by the lowest value:

Cr = 1/1 = 1

O = 3/1 = 3

Thus, the empirical formula for the oxide is CrO₃.

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About ten percent of users do not close Windows properly. Suppose that Windows is installed in a public library that is used by

lawyer [4039]

Answer:

Refer to the explanation

Step-by-step explanation:

As approximately 10% of users fail to close Windows properly, we determine:

The likelihood that a user neglects to shut down Windows correctly is $p=0.1;$
The likelihood that a user shuts the Windows properly is $q=1-p=1-0.1=0.9.$

A. On average,

one in ten users does not close Windows correctly;
10 out of 100 users fail to close Windows correctly.

B. The likelihood that precisely 8 out of the next 10 users will close Windows correctly is

$C^{10}_8\cdot q^{8}p^{10-8}=\dfrac{10!}{8!(10-8)!}\cdot (0.9)^8\cdot (0.1)^2=45\cdot (0.9)^8\cdot (0.1)^2\approx 0.1937$

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11 days ago

A battery has enough energy to operate eight toy bears for 21 hours. For how long could the battery operate 15 toy bears?

PIT_PIT [3949]

Answer:

28 hours required for 15 toy bears

Step-by-step explanation:

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10 days ago

Maggie is considering two investments. Investment A Investment B Principal $10,000 $8,000 Interest rate 3% 2.8% Time in years 5

Zina [3917]

To determine this, we will apply the simple interest formula: $A=P(a+rt)$
where
$A$ signifies the total amount.
$P$ indicates the principal amount.
$r$ represents the interest rate in decimal.
$t$ denotes the time period in years.

Investment A. The initial investment amount is $10,000, so $P=10000$ . The investment period is 5 years, meaning $t=5$ . To express the interest rate in decimal, divide it by 100%
$r= \frac{3}{100} =0.03$
Now, we can substitute these values into our formula to find $A$ :
$A=P(a+rt)$
$A=10000(1+0.03*5)$
$A=11500$

Investment B. $P=8000$ , $t=15$ , and $r= \frac{2.8}{100} =0.028$ .
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$A=8000(1+0.028*15)$
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In conclusion, investment A will yield a greater value than investment B at the investment period's conclusion.

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4 days ago

Read 2 more answers

A mercury thermometer records a temperature of 8 degrees Fahrenheit at 10:00am.If the Temperature drops by 3 degrees Fahrenheit

Svet_ta [4341]

Given:

The temperature recorded at 10:00 am is 8 degrees Fahrenheit.

The temperature decreases by 3 degrees Fahrenheit each hour.

To find:

The temperature at 2:00 pm on the same day.

Solution:

Let y represent the temperature after x hours since 10:00 am.