**Answer:**

97.994 g/mol

**Explanation:**

One molecule of H₃PO₄ contains three atoms of H, one of P, and four of O.

3H = 3 × 1.0079 u = 3.0237 u

1P = 1 × 30.974 u = 30.974 u

4O = 4 × 15.999 u = <u>63.996 u
</u>

Total = **97.994 u**

One molecule has a mass of 97.994 u.

One mole has a mass of 97.994 g.

The molar mass of H₃PO₄ is **97.994 g/mol**.

**Answer:**

55.84g

**Explanation:**

moles

mass = moles x molar mass

molar mass of HCl = 36.5g/mol

mass = 1.53 mol x 36.5 g /mol

mass = 55.84 g

Isotopes are atoms with different number of electrons

isotopes are very useful

for example isotope of uranium is used in atomic bombs and nuclear reactors radioactive isotopes are used to date ricks soils and archaeological objects.

isotopes have many uses that's why we study isotopes to know their uses

**Answer: students are the dependent variable and the cartoon are the independent variable**

**Explanation: because the cartoon are being the same ever and the opinion of the students is what changes**

**Answer:**

2

**Explanation:**

The maximum amount of electrons in an atom that can share those quantum numbers because of the spin quantum numbers (ms) +1/2 and -1/2.