2 years ago

Could anyone tell me the answer of this question?Pls answer fast

Mathematics

1 answer:

Viefleur [7K]2 years ago

3 0

Answer:

what is needed to be found??

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a quantity of ethanol is cooled from 47.9° C to 12.3°C and releases 3.12 KJ of heat. what is the mass of the ethanol sample?

victus00 [196]

Answer:

35.9 grams

Step-by-step explanation:

We use the formula:

$q=m*C_p*\Delta T$

Where

q is heat released

m is mass

C_p is the constant 2.44

ΔT is change in temperature

We put the info in the formula and solve for m (mass):

$q=m*C_p*\Delta T\\-3.12 = m*2.44(12.3-47.9)\\-3.12*10^3=m*(-86.864)\\m=35.9$

The mass of ethanol is 35.9 grams

8 0

3 years ago

What is 6 times less 420

alexandr1967 [171]

The correct answer is 70 because 420 divided by 6 is 70.

8 0

3 years ago

What is the answer for this i need help!!??

11Alexandr11 [23.1K]

Answer:

-243

Step-by-step explanation:

${( - 3)}^{ - 5} = \frac{1}{x} \\ \\ \therefore \: \frac{1}{ {( - 3)}^{ 5} } = \frac{1}{x} \\ \\ \therefore \: {( - 3)}^{ 5} = x \\ \\ \therefore \: - 243 = x \\ \\ \huge \red{ \boxed{\therefore \: x = - 243}}$

5 0

3 years ago

8 divde by 1/6 equals 48 because<br><br>

nika2105 [10]

Proof:

$8\div\frac{1}{6}=\frac{8}{1}\div \frac{1}{6}=\frac{8}{1}\times\frac{6}{1}=\frac{8\times6}{1}=\frac{48}{1}=48 \\$

6 0

3 years ago

Which ratios have a unit rate less than 1? choose all that apply.

DaniilM [7]

Answer:

2apply.

Step-by-step explanation:

6 0

2 years ago

Could anyone tell me the answer of this question?Pls answer fast​

Could anyone tell me the answer of this question?Pls answer fast