Choose the one alternative that best completes the statement or answers the ques

Question

Choose the one alternative that best completes the statement or answers the question. How many hydrogen atoms are represented in the formula (CH_3)_2CH_2 ? A) 8 B) 6 C) 9 D) 5 Which has the highest percent mass of Cl? A) C_2Cl_6 B) CCl^4 C) C_2Cl_4 D) C_2Cl_2 The correct formula for Sodium Nitride is: A) Na_3N B) NaNO_2 C) NaNO_3 D) Na_2NO_3 How many moles of NO_3 are there in 6.2g? A) 0.05 B) 10 C) 0.10 D) 384 Consider the following equation: 4NH_4 + 5O_2 rightarrow 4 NO + 6H_2O How many moles of water are produced when 2 moles of NH_4 react with excess Oxygen gas? A) 6 B) 3 C) 4 D) 5 When the following equation is balanced what is the smallest whole number coefficient for Ca^2+? Ca^2+ + PO^3+_4 rightarrow Ca_2(PO_4)_2 A) 4 B) 1 C) 3 D) 2 Which molecule contains a bent geometry? A) HF B) OF_2 C) CO^2+_3 D) SiO_2 Which element has properties most similar to Bromine? A) F B) Kr C) S D) Se Which of the following has the most electrons?

Explanation / Answer

6)

The product should be Ca3(PO4)2

It is composed of 3 unit of Ca2+ and 2 unit of PO43-

So, coefficient of Ca2+ is 3

Answer: C

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