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statuscvo [17]
4 years ago
14

Please help!!!

Chemistry
1 answer:
Natali5045456 [20]4 years ago
5 0

Answer:

1.586 J/g°C

Explanation:

So, we have the formula q = mc\Delta t.

Since heat released by the metal is = to the heat absorbed by the water (because they eventually become the same temperature in solution), we can say

m_{water}C_{water}(T_{water}-T_f) = - m_{metal}C_{metal}(T_{metal} - T_f)

Plugging in, we get:

59.2*4.184*(21- 34.9) = - 27*C_{metal}*(93 - 34.9)

Solving, we get C_{metal} = 1.586 J/g°C.

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What is the concentration of 10.00 mL of HBr if it takes 5mL of a 0.253M LiOH solution to neutralize it?
insens350 [35]
The chemical reaction would be:

HBr + LiOH = LiBr + H2O

We are given the concentration of the other reactant. We use these given values and the reaction to relate to moles of HBr needed. We do as follows:

0.253 mol / L ( .005 L) ( 1 mol HBr / 1 mol LiOH ) = 0.0013 mol HBr

Molarity = 0.0013 / 0.01 = 0.13 M
6 0
4 years ago
why are the theoretical density values of brass, bronze, and steel reported as a range of densities? how can you categorize thes
Julli [10]

<u>Answer:</u>

<em>Theoretical density values  </em>

  • brass- 8.4-8.73 gm/cm^3
  • bronze- 8.73 g/cm^3
  • steel- 7.75 - 8.05 gm/cm^3

<u>Explanation:</u>

All of these substances are<em> </em>alloys (a substance made from melting two or more substances, one of them usually being a metal). Brass is a combination of copper and zinc, bronze is mostly copper, tin and other non-metals as well and steel is majorly made up of iron and copper. These alloys have various uses and varying importance in different kinds of industries.

6 0
3 years ago
Does The nucleus of an atom contain all of the protons in the atom
insens350 [35]

Answer:

The nucleus, that dense central core of the atom, contains both protons and neutrons.

So to answer your question yes it does contain all of the protons in the atom.

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5 0
4 years ago
How many grams of molybdenum(Mo) are in 2.68E24 atoms of Mo?
loris [4]
<h3>Answer:</h3>

427 g Mo

<h3>General Formulas and Concepts:</h3>

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Reading a Periodic Table
  • Using Dimensional Analysis
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right
<h3>Explanation:</h3>

<u>Step 1: Define</u>

2.68E24 atoms Mo or 2.68 × 10²⁴ atoms Mo

<u>Step 2: Identify Conversions</u>

Avogadro's Number

Molar Mass of Mo - 95.94 g/mol

<u>Step 3: Convert</u>

<u />2.68 \cdot 10^{24} \ atoms \ Mo(\frac{1 \ mol \ Mo}{6.022 \cdot 10^{23} \ atoms \ Mo} )(\frac{95.94 \ g \ Mo}{1 \ mol \  Mo} ) = 426.966 g Mo

<u>Step 4: Check</u>

<em>We are given 3 sig figs. Follow sig fig rules and round.</em>

426.966 g Mo ≈ 427 g Mo

3 0
3 years ago
Zinc metal (Zn) reacts with hydrochloric acid (HCI) to produce hydrogen gas (H) and zinc chloride (ZnCl2). A scientist has powde
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Answer:

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