I’m stup!d. <br> please help:(

A student is measuring the mass of a two metal cylinders. The following data is collected. The actual mass of each cylinder is g

Lapatulllka [165]

Answer:

Absolute error in measurement of A = 0.3

Absolute error in measurement of B = 0.3

Explanation:

Absolute error is a measure of the amount of error in a measurement i.e. a measure of how far away a measurement is from a true value or an indication of the uncertainty in a measurement.

The Absolute Error is the difference between the actual and measured value. In formula, the absolute error, Δx is given as:

Δx = |xi – x|,

Where: xi is the measurement, x is the true value,

| | indicates that only absolute values are taken

In the measurements by the student in the question:

Metal Cylinder A

measured value = 12.4 grams

actual mass of metal cylinder A = 12.7 g

Using the absolute error formula; Δx = |xi – x|

Absolute error in measurement of A = |12.4 - 12.7| = 0.3

Metal Cylinder B

measured value = 75.4 grams

actual mass of metal cylinder B = 75.1 g

Using the absolute error formula; Δx = |xi – x|

Absolute error in measurement of B = |75.4 - 75.1| = 0.3

6 0

3 years ago

How many grams of NH3 can be produced from 2.30 mol of N2 and excess H2.

MrRa [10]

<h3>Answer:</h3>

78.34 g

<h3>Explanation:</h3>

From the question we are given;

Moles of Nitrogen gas as 2.3 moles

we are required to calculate the mass of NH₃ that may be reproduced.

<h3>Step 1: Writing the balanced equation for the reaction </h3>

The Balanced equation for the reaction is;

N₂(g) + 3H₂(g) → 2NH₃(g)

<h3>Step 2: Calculating the number of moles of NH₃</h3>

From the equation 1 mole of nitrogen gas reacts to produce 2 moles of NH₃

Therefore, the mole ratio of N₂ to NH₃ is 1 : 2

Thus, Moles of NH₃ = Moles of N₂ × 2

= 2.3 moles × 2

= 4.6 moles

<h3>Step 3: Calculating the mass of ammonia produced </h3>

Mass = Moles × molar mass

Molar mass of ammonia gas = 17.031 g/mol

Therefore;

Mass = 4.6 moles × 17.031 g/mol

= 78.3426 g

= 78.34 g

Thus, the mass of NH₃ produced is 78.34 g

3 0

3 years ago

An element contains 25 electrons. How many empty orbitals are in its valence energy level?

frez [133]

Answer:

No empty orbitals but five unpaired electrons.

Explanation:

Hello there!

In this case, when going over the empty orbitals in valence energy levels, it is required to develop the electron configuration in order to appropriately describe the element. In such a way, for the element whose atomic number is 25 because it equals the number of electrons, we obtain:

$1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^5$

It means that the d orbital is half filled which means that it does not have any empty orbital wherein two electrons are contained per orbital. Moreover, we can find 5 unpaired electrons according to:

↑ ↑ ↑ ↑ ↑

Which is the orbital notation.

Best regards!

4 0

3 years ago

What is the current in a 160 V circuit if the resistance is 2 Ω

Tomtit [17]

Answer:

<u><em>80 amperes </em></u>

Explanation:

4 0

4 years ago

Difference between phosphorus<br> and potassium

Blababa [14]

Answer:

Potassium is a mineral found in most of the foods we eat and is necessary in the diet because it helps with muscle movement and keeping the nervous system healthy. ... Phosphorus is also a mineral we get from eating certain foods. Phosphorus helps build strong bones and teeth.

8 0

3 years ago

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I’m stup!d. please help:(