15.0 mL of an unknown clear liquid is added to a 50 mL graduated cylinder. The mass of the liquid is determined to be 12.7 grams

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To determine the number of atoms present in 80.45 grams of magnesium, we require Avogadro's number and the weight of a single mole of magnesium.

Avogadro's number is 6.02 x 10^23 atoms, and the mass of one mole of magnesium is 24.31 grams.

1. First, divide by the weight of one mole of magnesium

80.45 / 24.31 ≈ 3.309 moles (rounded to appropriate significant figures)

2. Multiply the number of moles by Avogadro's number

3.309 x (6.02 x 10^23) ≈ 1.99 x 10^24 (rounded to appropriate significant figures)

Thus, in 80.45 grams of magnesium, there are approximately 1.99 x 10^24 atoms.

Answer: Mixture: Blood, Self raising flour,muesli,dyes, milk, tea, air, bronze

Pure substance: Copper wire, distilled water, table salt, oxygen.

Explanation:

A mixture is a substance composed of two or more compounds which are chemically independent and keep their individual chemical properties.

Examples: Blood, Self raising flour,muesli,dyes, milk, tea, air, bronze

A pure substance is defined as something with a uniform and constant composition and is called a pure substance.

Examples: Copper wire, distilled water, table salt, oxygen.

Answer: B.)

Explanation: Heat transfers from the pan to the surrounding environment.

Ba(OH)2 breaks down as shown in the equation, resulting in Barium ions and hydroxide ions.
Ba(OH)2 = Ba²⁺ + 2 OH⁻
The concentration of Ba²⁺ ions is 1.0 ×10^-3 M
Consequently, the concentration of OH⁻ ions will be 2× 1.0 ×10^-3 = 2.0 × 10^-3 M
Thus; the answer is 2.0 × 10^-3 M

La ecuación es p1 x v1 dividido por T1 = p1 x v2 = T2 pero dado que la presión permanece constante, eso no es necesario, por lo que la ecuación se simplifica a v1 dividido por t1 = v2 dividido por t2.

2135 cm3 dividido por 127 grados Celsius = x dividido por 206.

respuesta: 3460 cm3.