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3 years ago

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A small object has a mass of 82.2 grams. When completely immersed in a graduated cylinder with a water level of 25.0 mL, the obj

ect causes the water level to rise to 47.1 mL. What is the density of the object in g/mL? (Do not enter the units; only the numeric value.)

1 answer:

DENIUS [597]3 years ago

6 0

Answer:

3.72

Explanation:

Given data:

Mass of object = 82.2 g

Volume of water = 25.0 mL

Volume of water + object = 47.1 mL

Density of object = ?

Solution:

Volume of object:

Volume of object = (Volume of water + object) - Volume of water

Volume of object = 47.1 mL - 25.0 mL

Volume of object = 22.1 mL

Density of object:

d = 82.2 g/ 22.1 mL

d = 3.72 g/mL

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defon

The heat absorbed to raise temperature : Q = 31350 J

<h3>Further explanation </h3>

Given

m = mass = 150 g

Δt = Temperature difference : 50 °C

Required

Heat absorbed

Solution

Heat can be formulated

<em> Q = m.c.Δt </em>

The specific heat of water = c = 4.18 J/g °C

Input the value :

Q = 150 x 4.18 x 50

Q = 31350 J

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3 years ago

which term best describes the type of reaction that happens when a single element reacts with a molecule or compound producing a

Sonbull [250]

The answer to this question would be: C) a single replacement reaction

In single replacement reaction the molecule made in just one with an element. In this case, the compound is just swapping its element with a more reactive one, results in a more stable compound.
Contrast to the single replacement reaction, double replacement reaction or metathesis is the reaction which results in two new compounds. The cation from the molecule reaction is switching with the cation from other molecules.
In contrast to the double replacement reaction,

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3 years ago

2h2 o2 = 2h2o how many moles of water are produced from 13.35 mol of oxygen?

HACTEHA [7]

2 H2 + O2 = 2 H2O

1 mole O2 --------------- 2 moles H2O
13.35 moles O2 -------- ( moles H2O)

moles H2O = 13.35 x 2 / 1

= 26.7 moles of H2O

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3 years ago

Choose the true statement(s) about ions.

notka56 [123]

Answer: The TRUE statements about an ion includes:

a. Anions result when atoms gain an electron.

b. Cations have more protons than electrons.

Explanation:

The fundamental unit of matter is ATOM, which is the smallest particle of an element that can take part in a chemical reaction. The constituents of the atom are PROTON, NEUTRON and ELECTRONS.

The theory of the possible model of an atom and the position of each constituent within the atom was given by Lord Rutherford. The nucleus of an atom is made up of the protons and neutron while the electron revolves round it. IONS are formed when these atoms either gains or losses these electrons.

When an atom gains electrons to complete it's outermost shell, it acquires a negative charge. This is because the electrons are more than the protons. This type of atom is called an ANION

When an atom losses an electron, it in turn acquires a positive charge. This is because the proton are more than the electrons. This is called the CATION.

Therefore the true statement about ions is option a and b.

Option C is false because it is an electron that is either loss or gained to form an ion not Neurons. Option D is wrong because Na+ lost one electron to become positively charged.

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3 years ago

Raoult's law accounts for the fact that the vapor pressure of a solvent will decrease as the mole fraction of the solvent is dec

Vesnalui [34]

Raoult's law accounts for the fact that the vapor pressure of a solvent will decrease as the mole fraction of the solvent is decreased. In considering the mole fraction, it is important to consider the total moles of dissolved particles. Remember: a particle can be a dissolved molecule or ion. Which aqueous solutions would have the lowest vapor pressure.

0.1 M $NH_4NO_3(aq)$ , 0.1 M $NaF(aq)$ , 0.1 M $LiNO_3(aq)$ , 0.1 M $Na_3PO_4(aq)$ and 0.1 M $HC_2H_3O_2(aq)$

Answer: 0.1 M $Na_3PO_4$

Explanation:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

$\frac{p^o-p_s}{p^o}=i\times x_2$

where,

$\frac{p^o-p_s}{p^o}$ = relative lowering in vapor pressure

i = Van'T Hoff factor

$x_2$ = mole fraction of solute

1. For 0.1 M $NH_4NO_3$

$NH_4NO_3\rightarrow NH_4^{+}+NO_3^{-}$

, i= 2 as it is a electrolyte and dissociate to give 2 ions. and concentration of ions will be $1\times 0.1+1\times 0.1=0.2$

2. For 0.1 M $NaF$

$NaF\rightarrow Na^{+}+F^{-}$

, i= 2 as it is a electrolyte and dissociate to give 2 ions, concentration of ions will be $1\times 0.1+1\times 0.1=0.2$

3. For 0.1 M $LiNO_3$

$LiNO_3\rightarrow Li^{+}+NO_3^{-}$

, i= 2 as it is a electrolyte and dissociate to give 2 ions. and concentration of ions will be $1\times 0.1+1\times 0.1=0.2$

4. For 0.1 M $Na_3PO_4$

$Na_3PO_4\rightarrow 3Na^{+}+PO_4^{3-}$

, i= 4 as it is a electrolyte and dissociate to give 4 ions. and concentration of ions will be $3\times 0.1+1\times 0.1=0.4$

5. For 0.1 M $HC_2H_3O_2(aq)$

$HC_2H_3O_2(aq)\rightarrow CH_3COO^{-}+H^{+}$ [/tex]

, i= 2 as it is a electrolyte and dissociate to give two ions, concentration of ions will be $2\times 0.1=0.2$

Thus as concentration of solute is highest for 0.1 M $Na_3PO_4$ , the vapor pressure will be lowest.

8 0

4 years ago