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Alborosie
3 years ago
6

How many grams of KBr are required to make 350. mL of a 0.115 M KBr solution?

Chemistry
2 answers:
Vsevolod [243]3 years ago
6 0
0.115 M means that 0.115 moles of KBr are contained in a volume of 1000 ml, therefore a volume of 350 ml will have (0.115 × 0.35) = 04025 moles
From the formula of molarity moles = molarity × volume in liters
1 mole of KBr is equivalent to 119 g
Therefore, the mass = 0.04025 ×  119  g = 4.79 g
lutik1710 [3]3 years ago
4 0

Answer is: 4.79 grams og KBr are required.

V(KBr) = 350 mL ÷ 1000 mL/L.

V(KBr) = 0.350 L; volume of potassium bromide solution.

c(KBr) = 0.115 M; molarity of potassium bromide solution.

n(KBr) = c(KBr) · V(KBr).

n(KBr) = 0.115 mol/L · 0.350 L.

n(KBr) = 0.04025 mol, amount of substance.

m(KBr) = n(KBr) · M(KBr).

m(KBr) = 0.04025 mol · 119 g/mol.

m(KBr) = 4.79 g; mass of potassium bromide.

M - molar mass.

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A researcher selects three regions X, Y, and Z, and records the types of discharge that enter the regions’ rivers.
elixir [45]

Region Z should be monitored more closely to avoid health issues.

<h3>Why region Z should be monitored?</h3>

Region Z should be monitored more closely to avoid potential health issues because region Z produces waste from chemical plants which are dangerous for our water and environment so we can conclude that Region Z should be monitored more closely in order to avoid health issues.

Learn more about discharge here: brainly.com/question/4918499

3 0
2 years ago
Chemistry an atom of strontium has at least four different isotopes. what is different between an isotope of 86sr and an isotope
lions [1.4K]
Isotopes are atoms of the same element that differ in the number of neutrons.

Remember that all the atoms of an element have the same number of protons. So the only difference between isotopes of an element is the number of neutrons.

86 Sr means that the mass number of this isotope is 86. Also, remember that the mass number is the number of protons plus the number of neutrons.

87 Sr means that the mass number of this isotope is 87.

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Answer: 1 neutron


5 0
3 years ago
How many moles of hydrogen atoms are there in one mole of C6H12O2
zvonat [6]

In 1 molecule of the compound C₆H₁₂O₂ there are 12 moles of hydrogen atoms

<h3>Further explanation</h3>

Given

C₆H₁₂O₂ compound

Required

moles of Hydrogen

Solution

In a compound, there is a mole ratio of the constituent elements.

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

In the C₆H₁₂O₂ compound, there are 3 forming elements: C, H and O

The number of each element is indicated by its subscript

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7 0
3 years ago
In relation to chemical solutions, which term does not express a degree of saturation?
Marizza181 [45]
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4 0
3 years ago
Read 2 more answers
Determine the molarity of 1.2 mol KCl in 1.1 L of a solution?
victus00 [196]

Answer:

1.1 M

General Formulas and Concepts:

  • Molarity = moles of solute / liters of solution

Explanation:

<u>Step 1: Define variables</u>

1.2 mol KCL

1.1 L of solution

M = unknown

<u>Step 2: Solve for Molarity</u>

  1. Substitute:                    M = 1.2 mol/1.1 L
  2. Evaluate:                       M = 1.09091

<u>Step 3: Check</u>

<em>We are given 2 sig figs. Follow sig fig rules.</em>

1.09091 M ≈ 1.1 M

7 0
3 years ago
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